[WIP] Migrate tests to match new project structure

[Copilot]

Cloud agent has begun work on Recently, I migrated... and will update this pull request as work progresses.

Original prompt

Recently, I migrated code from an old repo into the src/BuildInsights folder. I renamed projects and shuffled code around a lot.
In the test/BuildInsights I copied test projects from the old repo.
I would like you to migrate the tests to match the new code:

• Don't change the code in src/ unless something was made untestable
• Cross reference test files with their original classes that they are testing
• Create new test projects BuildInsights.*.Tests for each of the src/BuildInsights projects that has a matching test class
• First focus on moving the classes into the appropriate new test projects
• Only then focus on making the tests compile and green

The user has attached the following file paths as relevant context:

• .github\copilot-instructions.md

Created from VS Code.

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