Fix TypeScript 7 workspace package detection

[Nanditha264]

Summary

Fix workspace TypeScript detection in the VS Code extension for TypeScript 7 packages.

Previously, the extension only checked for the legacy @typescript/native-preview package when detecting a TypeScript 7 workspace installation. Current TypeScript 7 releases use the standard typescript package instead.

This change:

• Detects TypeScript 7 installed at node_modules/typescript.
• Preserves support for the legacy @typescript/native-preview package.
• Uses the existing pathHasTsserverJs check to avoid treating TypeScript 5/6 packages as TypeScript 7.
• Reuses the existing resolveTsdkPathToExe resolution logic.
• Preserves candidate precedence and multi-root workspace behavior.
• Updates package-resolution tests for the supported layouts.

Testing

• npm test -w native-preview
• npm run extension:build
• npx dprint check packages/vscode-typescript/src/session.ts packages/vscode-typescript/src/tsdkPackage.ts packages/vscode-typescript/src/util.ts packages/vscode-typescript/test/tsdkPackage.test.ts

All checks pass.

[typescript-automation]

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

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[Copilot]

Copilot review overview

🟡 Changes recommended

The changed workspace detection behavior lacks direct regression coverage.

Review effort: Balanced
Findings: 1

Open (1)

• Add regression coverage for workspace TypeScript package detection · New

What changed in this PR

Adds TypeScript 7 workspace package detection to the VS Code extension while retaining legacy package support.

Changes:

• Detects standard and legacy TypeScript 7 packages.
• Filters out packages containing tsserver.js.
• Extends package-resolution fixtures.

File	Description
packages/​vscode-typescript/​src/​session.ts	Adds workspace package candidates and detection filtering.
packages/​vscode-typescript/​src/​util.ts	Exports the existing tsserver.js check.
packages/​vscode-typescript/​test/​tsdkPackage.test.ts	Adds legacy package-resolution coverage.

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