Adopt unified js/ts setting for diagnostic settings

[mjbvz]

For #292934

Also renames validate.enable to validate.enabled to align with other settings

[Copilot]

Pull request overview

Updates the TypeScript/JavaScript extension to adopt unified js/ts.* configuration keys for diagnostic-related settings (per #292934), including aligning validate.enable to the new validate.enabled naming while continuing to honor deprecated settings.

Changes:

• Introduces js/ts.validate.enabled and js/ts.reportStyleChecksAsWarnings settings and deprecates the older javascript.* / typescript.* equivalents.
• Switches diagnostic validation reads to use readUnifiedConfig(...) with fallback to deprecated keys (including the validate.enable → validate.enabled rename).
• Updates localization strings for the new unified settings and deprecation messaging.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
extensions/typescript-language-features/src/utils/configuration.ts	Broadens configuration scope typing to vscode.ConfigurationScope for unified setting reads.
extensions/typescript-language-features/src/typeScriptServiceClientHost.ts	Reads reportStyleChecksAsWarnings via unified js/ts.* setting with fallback to typescript.*.
extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts	Moves validation enablement to unified js/ts.validate.enabled with fallback to deprecated validate.enable.
extensions/typescript-language-features/src/languageProvider.ts	Updates diagnostic/suggestion toggles to read unified settings using language-aware configuration scope.
extensions/typescript-language-features/package.nls.json	Adds localized strings for unified validation + deprecation messages.
extensions/typescript-language-features/package.json	Contributes new js/ts.* settings and deprecates old javascript.* / typescript.* settings.