Fix tests

[TheAngryByrd]

WHAT

🤖 Generated by Copilot at 1eb2d64

Improve and update tests for sample 3 workspace. Refactor test code with tryFindLoadedProject helper function.

🤖 Generated by Copilot at 1eb2d64

We're testing the sample 3 workspace, me hearties
With F# and C# projects galore
We'll use tryFindLoadedProject to check the assertions
And update the notifications and more

🧪🔄🎨

WHY

Trying to fix those pesky tests in CI.
They keep me asking, why why why.

HOW

🤖 Generated by Copilot at 1eb2d64

• Add tryFindLoadedProject function to simplify and improve test assertions for finding loaded projects in notifications (link)
• Refactor testSample3 function to use tryFindLoadedProject instead of brittle pattern matching on notifications list (link)
• Update expected notifications for testSample3GraphExpected list to match the actual order and number of notifications from the project graph loader (link)
• Enable testSample3 function for both workspace loader and project graph loader implementations, as the new test suite and tryFindLoadedProject function have resolved the previous issues (link)
• Enable solution tests and render tests for sample 3 workspace, as the new test suite and the fixes to the project graph loader have resolved the previous issues (link)