fix(@angular/build): skip normalization of relative externals

[dmitry-stepanenko]

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• 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
• Other... Please describe:

What is the current behavior?

In this PR #29753 there was a regression that now prevents corrent handling of external local dependencies. In my case the configuration for the build target looks like this "externalDependencies": ["/assets/js/*"]. This ensures that all scripts in the given folder are marked as external.

With the change in the PR mentioned above this no longer works. To bring back the old behavior I'm adding an extra condition to check whether provided dependency is indeed a package name or a relative/absolute path.

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[alan-agius4]

LGTM, thanks for your contribution.

[dgp1130]

The changes were merged into the following branches: main, 19.2.x

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