[browser][MT] Add new test for multi-threading SignalR in Blazor WBT

[ilonatommy]

Fixes #97085.
New blazor hosted test app that is runs one instance per test, we manipulate the actions using buttons that are clicked after reading a message about completing the previous action.
A minor change not connected with the original issue: mechanism for server-logs accumulation was added to AppTestBase's RunSdkStyleApp. Previously these logs were swallowed.

[ghost]

Tagging subscribers to 'arch-wasm': @lewing
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Issue Details

---

Fixes #97085.

1. New blazor hosted test app that is runs one instance per test (not using xunit fixtures like aspnetcore does, this can be a follow-up improvement)
2. Flow:

• WBT communicate with the app using url query (message and transport arguments),
• On page init, client sets up signalR connection (of transport type, transport might be longPolling or webSockets),
• Client sends message to server that receives it and sends it back, client on receiving confirmation that server got the message sends exit request to server, app stops

3. Client logs are available through Playwright tools, server logs are written to file that is in artifacts/bin/Wasm.Build.Tests/Release/net9.0/linux-x64/xharness-output/logs and will be available on Azure when run on CI.

Current work

1. Assert failed: SharedArrayBuffer is not enabled on this page. Please use a modern browser and set Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy even though MT is on and right runtime is used
2. We're missing repro and remaining tests (e.g. websockets signalR).

Author:	ilonatommy
Assignees:	ilonatommy
Labels:	arch-wasm, area-VM-threading-mono
Milestone:	-

[pavelsavara]

please drop all the CSS and visual files from the blazor template, it's just git waste

[ilonatommy]

Setting ContentRootPath to BlazorHosted.Client did not help with Static files may be unavailable. Reverting to default.

[] Workload updates are available. Run `dotnet workload list` for more information.
[] Executing - C:\helix\work\workitem\e\dotnet-latest\dotnet.exe run -c Debug --no-build  in pwd C:\helix\work\workitem\e\wbt artifacts\SignalRClientTests_mr3fesfn_iad\BlazorHosted.Server
	[DOTNET_ROOT] = C:\helix\work\workitem\e\dotnet-latest
	[DOTNET_INSTALL_DIR] = C:\helix\work\workitem\e\dotnet-latest
	[DOTNET_MULTILEVEL_LOOKUP] = 0
	[DOTNET_SKIP_FIRST_TIME_EXPERIENCE] = 1
	[PATH] = C:\helix\work\workitem\e\dotnet-latest;D:\a\_work\1\s\artifacts\bin\chromedriver\chromedriver_win32;C:\helix\work\correlation\dotnet-latest;C:\helix\work\correlation\xharness-cli;C:\helix\work\correlation\dotnet-cli;C:\helix\work\correlation\chrome-win;C:\helix\work\correlation\chromedriver_win32;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Users\ContainerAdministrator\AppData\Local\Microsoft\WindowsApps;C:\Python;C:\python\scripts;C:\Program Files\nodejs\;C:\7z;C:\git\cmd;C:\Users\ContainerAdministrator\AppData\Roaming\npm;C:\Users\ContainerAdministrator\.jsvu\bin
	[EM_WORKAROUND_PYTHON_BUG_34780] = 1
	[WasmEnableWebCil] = false
[] info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[63]
[]       User profile is available. Using 'C:\Users\ContainerAdministrator\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest.
[] info: Microsoft.AspNetCore.Mvc.Infrastructure.DefaultActionDescriptorCollectionProvider[1]
[]       No action descriptors found. This may indicate an incorrectly configured application or missing application parts. To learn more, visit https://aka.ms/aspnet/mvc/app-parts
[] info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[58]
[]       Creating key {77b448d9-fade-4e98-9912-2e3a5d60cd64} with creation date 2024-02-27 16:38:27Z, activation date 2024-02-27 16:38:27Z, and expiration date 2024-05-27 16:38:27Z.
[] info: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[39]
[]       Writing data to file 'C:\Users\ContainerAdministrator\AppData\Local\ASP.NET\DataProtection-Keys\key-77b448d9-fade-4e98-9912-2e3a5d60cd64.xml'.
[] info: Microsoft.Hosting.Lifetime[14]
[]       Now listening on: http://localhost:5000
[] info: Microsoft.Hosting.Lifetime[0]
[]       Application started. Press Ctrl+C to shut down.
[] info: Microsoft.Hosting.Lifetime[0]
[]       Hosting environment: Production
[] info: Microsoft.Hosting.Lifetime[0]
[]       Content root path: C:\helix\work\workitem\e\wbt artifacts\SignalRClientTests_mr3fesfn_iad\BlazorHosted.Server\bin\Debug\net9.0\../../../../BlazorHosted.Client
Launching chrome ('C:\helix\work\correlation\chrome-win\chrome.exe') via playwright with args = --explicitly-allowed-ports=5000,--ignore-certificate-errors
[] info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
[]       Request starting HTTP/1.1 GET http://localhost:5000/chat?transport=LongPolling&message=ping - - -
[] info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0]
[]       Executing endpoint 'Fallback {*path:nonfile}'
[] info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[2]
[]       Sending file. Request path: '/index.html'. Physical path: 'C:\helix\work\workitem\e\wbt artifacts\SignalRClientTests_mr3fesfn_iad\BlazorHosted.Client\wwwroot\index.html'
[] info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1]
[]       Executed endpoint 'Fallback {*path:nonfile}'
[] info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
[]       Request finished HTTP/1.1 GET http://localhost:5000/index.html?transport=LongPolling&message=ping - 200 554 text/html 42.7901ms
[] info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
[]       Request starting HTTP/1.1 GET http://localhost:5000/_framework/blazor.webassembly.js - - -
[] info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
[]       Request finished HTTP/1.1 GET http://localhost:5000/_framework/blazor.webassembly.js - 404 0 - 8.0721ms
[] info: Microsoft.AspNetCore.Hosting.Diagnostics[16]
[]       Request reached the end of the middleware pipeline without being handled by application code. Request path: GET http://localhost:5000/_framework/blazor.webassembly.js, Response status code: 404
Exception: System.TimeoutException: Timeout 30000ms exceeded.

log

[maraf]

Looks great! Thank you for implementing the general approach!