bun -> rush

[kristina-fefelova]

No description provided.

[Copilot]

Pull Request Overview

This PR replaces Bun-based tooling and workflows with Rush, introducing new Rush scripts, configs, and updating docs and CI pipelines accordingly.

• Added a generated Rush wrapper script and numerous Rush configuration files under common/config/rush/
• Updated README and GitHub Actions to invoke Rush commands instead of Bun
• Added a sample commit-msg hook and configured JSON-with-comments support in .gitattributes

Reviewed Changes

Copilot reviewed 112 out of 112 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
common/scripts/install-run-rush-pnpm.js	Adds a generated script to install and run Rush with PNPM
common/git-hooks/commit-msg.sample	Introduces a sample commit-msg Git hook
common/config/rush/version-policies.json	Adds Rush version policy configuration
common/config/rush/subspaces.json	Adds Rush subspaces experimental configuration
common/config/rush/rush-plugins.json	Adds Rush plugin configuration
common/config/rush/repo-state.json	Adds generated Rush repo-state file
common/config/rush/pnpm-config.json	Adds PNPM config for Rush
common/config/rush/experiments.json	Adds experimental feature toggles for Rush
common/config/rush/custom-tips.json	Adds custom tips configuration for Rush
common/config/rush/common-versions.json	Adds common dependency version selections
common/config/rush/command-line.json	Adds custom Rush CLI phases, commands, and parameters
common/config/rush/cobuild.json	Adds Rush cobuild feature configuration
common/config/rush/build-cache.json	Adds Rush build cache feature configuration
common/config/rush/artifactory.json	Adds Rush Artifactory integration configuration
common/config/rush/.pnpmfile.cjs	Adds a .pnpmfile.cjs hook for PNPM
common/config/rush/.npmrc-publish	Adds .npmrc-publish for Rush publish
common/config/rush/.npmrc	Adds .npmrc for Rush install operations
README.md	Updates documentation to use Rush instead of Bun
.github/workflows/main.yaml	Updates CI to use Rush commands and Node.js 22
.gitattributes	Configures JSON-with-comments language for Rush configs