fix(sdks): migrate VSCode TypeScript settings

[arko1995]

What's the problem this PR addresses?

@yarnpkg/sdks currently generates the deprecated VS Code TypeScript settings:

{
"typescript.tsdk": ".yarn/sdks/typescript/lib",
"typescript.enablePromptUseWorkspaceTsdk": true
}

These settings have been replaced by the unified JavaScript and TypeScript settings:

{
"js/ts.tsdk.path": ".yarn/sdks/typescript/lib",
"js/ts.tsdk.promptToUseWorkspaceVersion": true
}

Simply adding the new settings isn't sufficient for existing projects, since the deprecated settings would remain in .vscode/settings.json.

Fixes #7107.

...

How did you fix it?

Updated the VS Code TypeScript SDK generator to use the new js/ts.tsdk.* settings.
Extended the workspace configuration helper so obsolete settings can be removed before applying a patch.
Removed the deprecated typescript.tsdk and typescript.enablePromptUseWorkspaceTsdk settings during migration.
Preserved unrelated user-defined VS Code settings.
Updated the SDK command help text to reference the new setting name.
Added tests for both fresh settings generation and migration of an existing settings file.

The removal and replacement happen during the same settings-file update.

Tests

Added tests covering:

Generating the unified settings for a new project.
Removing deprecated settings from an existing project.
Preserving unrelated user settings during migration.
yarn test:unit packages/yarnpkg-sdks/tests/vscode.test.ts --runInBand

Result:

Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Related work

I'm aware of #7116 and #7119, which also address #7107. This implementation focuses on performing the migration in a single configuration update and includes automated coverage for both fresh and existing projects.
...

The Netlify failure appears unrelated to this PR.

I reproduced the exact same failure from a clean detached worktree at the current origin/master commit (0a230c14e):

Docusaurus static site generation failed for:
- /configuration/yarnrc

Using exampleKeys without patternProperties is not supported (in catalog)

This PR only changes packages/yarnpkg-sdks and its release metadata. origin/master...HEAD reports 0 3, and none of the PR changes reference catalog, exampleKeys, patternProperties, or the Docusaurus configuration.

Could the Netlify check be waived/retried after the base documentation build is fixed?

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.