Add check `Uniform Versioning Validation`

- Pipeline uses GH Action
- Tool is clone of TypeSpecValidation
- Rules
- Verify default `$(tag)` exists
- Add more rules we can think of now, or as we find more bugs in specs
- Support suppressions.yaml
- Run on PRs to give clear guidance how to fix `readme.md`
- Run on all specs in main
- If only a few failures, add suppressions then enable pipeline "ReadmeValidation - All"

## Notes from @konrad-jamrozik

A quickstart guide I wrote for creating such checks is here:
- https://github.com/Azure/azure-rest-api-specs/issues/28773#issue-2254359536

Closely related to:
- https://github.com/Azure/azure-sdk-tools/issues/8203