chore: Fix build pipeline and routing for React samples.

[willum070]

Overview
This PR fixes a bug in our sample build pipeline where React/Vite samples were incorrectly being routed through the vanilla docs.sh script, causing their src/ directories to be destructively flattened and breaking DevSite macro expectations.

Key Changes:

• samples/dist.sh:
  • Updated dist.sh to delete dist prior to copying. This ensures hashed assets don't perpetually accumulate over successive local builds.
• samples/build-single.sh:
  • Added conditional detection for React projects (checking for src/app.tsx|jsx|js). React samples are now properly routed to react-docs.sh.
  • Added a rm -rf dist step prior to tsc execution. This ensures Vite's hashed assets don't perpetually accumulate over successive local builds.
• samples/react-docs.sh:
  • Completely modernized to satisfy both DevSite live-render macros and snippet tab structures.
  • Preserves original source structure by safely nesting app.tsx inside docs/src/.
  • Drops the compiled app.js and style.css directly into the docs/ root exactly where DevSite expects them for live rendering.
• Triggered React Rebuilds:
  • Added a harmless "buildRevision": 1 field to the package.json of all React (rgm-* and react-ui-kit-*) samples to cleanly force a CI rebuild and output sync without polluting the source files.