fix(compute/deploy): check compute product entitlement when creating service

[Integralist]

A few changes are happening in this PR but the primary change is to check the entitlement the user has to the Compute product and to display a message informing them that the new service they're about to create will be part of a trial access (unless they are already on a trial, or they've paid for access).

Additional changes worth noting:

• Refactoring the code to avoid passing a function through multiple call sites (just wasn't necessary).
• Removing the use of a function type that used partial application (a result of the above refactor).
• Replacing the "trial activation" logic with a simpler "check entitlement" API call.
• Refactoring the 'deploy' tests so we have a default behaviour for mocking the entitlement call **

** The original test code was duplicating the same mocking code everywhere and it just wasn't necessary. Setting a failure mock mode was the only special case that needed explicit overriding.

[Integralist]

@kpfleming feel free to rebase and take over this PR if you want to.