chore(infra): move tests folder to top level

[SoonIter]

	🚀 This PR description was created by Ellipsis for commit 1f11b4f.

Summary:

This PR moves the tests folder to the top level of the project structure and updates various files to reflect this change, including workflow files, test setup scripts, and test files.

Key points:

• Moved tests folder to top level.
• Updated .github/workflows/ci.yml and .github/workflows/publish.yml to use .nvmrc for Node.js version.
• Updated scripts/test/testSetup.ts to import activate from new utils location.
• Updated src/extension.ts to use path.join for configUri.
• Moved and updated test files in src/test to tests.
• Moved and updated src/test/utils.ts to tests/utils.ts.

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[HerringtonDarkholme]

any merit to move test to top level?

[ellipsis-dev]

Looks good to me!

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[SoonIter]

any merit to move test to top level?

:-) There are no obvious benefits but I think we will move the tests directory to the top layer sooner or later, because we use tsx to run ts code instead of compiling it. By the way, I'm testing the failing reason for window CI in this pr , it seems that Macos is also unstable ...