fix(#2736): canonicalize PURE annotations in dist-es5 (module) output

[hectorhdzg]

Modern bundlers (Rolldown / Vite 8) prefer the package "module" entry, which resolves to the per-module dist-es5 tsc output. TypeScript emits parenthesized PURE annotations with whitespace after the opening paren (e.g. ( /*#__PURE__*/"http.")), which Rolldown rejects with [INVALID_ANNOTATION]. The existing rollup fixPureAnnotations() pass only covers the bundled dist/es5 ("main") output, so the ESM consumer path stayed broken (#2737 only fixed the bundle).

Changes:

• Add shared tools/pureAnnotations.js (single source of truth for the canonicalization regex), reused by both rollup.base.config.js and the new grunt task.
• Add "fix-pure" grunt multitask that canonicalizes dist-es5/**/*.js after the tsc compile; wired into the shared tsBuildActions pipeline for all packages.
• Extract shared getDistPackageRoots() in gruntfile.js (reused by validate-es5 and fix-pure).
• Keep the wrapping parens (required for older Rollup/Webpack/Terser to tree-shake the constants), per maintainer guidance.
• Extend AISKU/AppInsightsCore size tests to assert canonical PURE form in the dist-es5 module output.

Fixes #2736

[Copilot]

Pull request overview

Fixes ESM consumer builds by canonicalizing parenthesized PURE annotations in the per-module dist-es5 TypeScript output (the module entry), aligning it with the existing rollup-bundle normalization done for dist/es5 (the main entry) to avoid Rolldown/Vite 8 [INVALID_ANNOTATION] warnings.

Changes:

• Introduces a shared PURE-annotation canonicalization helper (tools/pureAnnotations.js) and reuses it in both rollup and a new grunt post-process step.
• Adds a new fix-pure grunt multitask and wires it into the shared tsBuildActions() pipeline to rewrite dist-es5/**/*.js after compile.
• Extends AISKU and AppInsightsCore size tests to assert non-canonical PURE spacing is not present in dist-es5 module outputs.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/pureAnnotations.js	Adds shared regex + helper to canonicalize spaced PURE annotations to the flush form.
tools/grunt-tasks/fixPureAnnotations.js	New grunt multitask (fix-pure) to rewrite emitted dist-es5 JS files after tsc compile.
rollup.base.config.js	Reuses shared canonicalization helper inside fixPureAnnotations() renderChunk step.
gruntfile.js	Adds fix-pure config + integrates the task into tsBuildActions(); extracts shared package-root mapping.
shared/AppInsightsCore/Tests/Unit/src/ai/AppInsightsCoreSize.Tests.ts	Adds a dist-es5 PURE-annotation validation fetch/test alongside existing dist validation.
AISKU/Tests/Unit/src/AISKUSize.Tests.ts	Adds a dist-es5 PURE-annotation validation fetch/test alongside existing dist validation.
RELEASES.md	Documents the Rolldown/Vite 8 PURE annotation fix and references #2736.