fix(@angular/cli): fixes Yarn v2 support for registry configuration

[petomi]

Adds support for yarnrc.yml files so that users of Yarn v2+ who attempt to run ng add or ng update do not experience a bug where the incorrect registry file extension (.yarnrc) is selected.

Fixes #23448

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

What is the current behavior?

Currently repositories using Yarn v2 or higher do not use the correct registry configuration file format, which causes issues when running ng-cli commands that require access to private repositories. See: https://github.com/angular/angular-cli/issues/23448

Issue Number: 23448

What is the new behavior?

The ng add and ng update commands check the correct file format (yarnrc.yml) for any repositories using Yarn version 2 or higher.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information