Add PR checks for console

[a5anka]

Summary

Add GitHub Actions PR checks for the console React frontend to validate code quality before merging.

Proposed Checks

Check	Command	Description
Install	rush install	Install all dependencies
Build	rush rebuild --production	Build all packages in dependency order
Lint	rush lint	Run ESLint across all packages (if configured)

Migration Note

There's an existing workflow at console/.github/workflows/ci.yml that can be referenced or migrated. It currently runs:

• rush change --verify
• rush install
• rush rebuild --verbose --production

References

• Rush config: console/rush.json
• Existing CI: console/.github/workflows/ci.yml