chore: promote to v2 stable

- deletes all RC change files
- adds a new change file to promote all packages to v2 stable
- manually fix the tauri-driver, tauri-macos-sign, tauri-bundler versions so the next covector bump will move them to 2.0.0
- manually patch the metadata-v2.json file so the next covector update will mark all packages as 2.0.0

Author: lucasfernog