feat: configurable request timeout for carddav sync

[pabzm]

Big federated setups may need a longer timeout, which they now can configure.

This is motivated by a debugging session, in which we had to raise the timeout but could do so only via a patch.

The default timeout length doesn't change with this PR.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

because backports

[github-actions]

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[miaulalala]

1) OCA\DAV\Tests\unit\CardDAV\SyncServiceTest::testEmptySync
ArgumentCountError: Too few arguments to function OCA\DAV\CardDAV\SyncService::__construct(), 6 passed in /home/runner/work/server/server/apps/dav/tests/unit/CardDAV/SyncServiceTest.php on line 62 and exactly 7 expected

lmk if you need help with the tests

[hamza221]

/backport to stable30