Update bundled LLVM tools for the shared bin layout

[Colen Garoutte-Carson (Colengms)]

Update the extension to find clang-format and clang-tidy under Extension/bin
after their relocation from Extension/LLVM/bin.

The bundled-version check and Unix executable-permission setup now use the new
paths. The local binary bootstrap accepts both released extensions using the
legacy layout and extensions using the new layout, normalizing either into
bin. Prepublish cleanup also removes stale LLVM directories.

This is coordinated with the native change that packages the LLVM tools beside
the VC runtime DLLs.

Validation:

• TypeScript build passes.
• ESLint passes.
• Bootstrap tests pass for both legacy and new layouts.
• git diff --check passes.

[Copilot]

Copilot review overview

🔵 Needs a closer look

.gitignore does not cover the copied tool binaries, leaving untracked files that cleanup cannot remove.

Review tier: Lite
Findings: None

What changed in this PR

Updates bundled LLVM tools from Extension/LLVM/bin to Extension/bin while preserving legacy bootstrap compatibility.

Changes:

• Updated tool lookup and executable permissions.
• Normalized legacy and new binary layouts.
• Added cleanup and tests for both layouts.

File	Description
Extension/​src/​main.ts	Uses shared bin paths for bundled tools.
Extension/​src/​LanguageServer/​settings.ts	Checks bundled tool versions from bin.
Extension/​.scripts/​vscode.test.mjs	Tests legacy and new layouts.
Extension/​.scripts/​copyExtensionBinaries.ts	Copies both layouts into the shared directory.
Extension/​.scripts/​clean.ts	Removes stale LLVM directories.

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