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This PR bumps Vitest from v2 to v4. As far as I know we don't use any Vitest specific features in our tests, but had to upgrade the `vitest.workspace.ts` file to a `vitest.config.ts` file instead. The only features we use are the typical `describe`, `it`, `test`, and `expect` functions. The only other part we use is `vi.spyOn` and `vi.fn` but those didn't change in API either. The test shards were removed to prevent errors. Not all suites have enough files / tests to be broken up into 3 parts so Vitest now errors when that happens. ### Test plan 1. All tests should pass in CI. 2. All integration tests should pass in CI. --------- Co-authored-by: Jordan Pittman <jordan@cryptica.me>