Bump vitest dependencies

[hl662]

• Consume 2.1.5 for vitest related dependencies
• All vitest deps follow the same version number, to avoid dependency mismatch warnings when running tests.

[aruniverse]

Why didn't rush catch this?

[hl662]

Why didn't rush catch this?

The mismatched dependencies were in the pnpm lockfile. Some were '2.1.1', while others were '2.1.0'. I guess rush doesn't catch mismatched deps that are in lockfiles

[hl662]

setting back to draft for now, circling back to fix regression for vitest/browser at a later point

[hl662]

Marked as active again - I had to update the setup file for core frontend to import the barrel file. Vitest now inlines setup files into test files , messing up dependency resolution in test files and reintroducing circular imports otherwise

[mergify]

This pull request is now in conflicts. Could you fix it @hl662? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/