fix(compiler-cli): log ngcc skipping messages as debug instead of info

[filipesilva]

PR Checklist

Please check if your PR fulfills the following requirements:

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

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

ngcc messages related to skipping are logged to info, which makes it hard to filter them out.

What is the new behavior?

ngcc messages related to skipping are logged to debug instead of info.

Does this PR introduce a breaking change?

• Yes
• No

Other information

Related to angular/angular-cli#14194, angular/angular-cli#14320

[mary-poppins]

You can preview dbee62e at https://pr30232-dbee62e.ngbuilds.io/.

[mary-poppins]

You can preview 820db13 at https://pr30232-820db13.ngbuilds.io/.

[petebacondarwin]

Added master and patch branches because this is important enough for CLI that it should go in 8.0.0

[kara]

@filipesilva This doesn't apply cleanly to the patch branch. Can you create a separate PR for the patch branch?

[filipesilva]

@kara it's now up at #30289

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