fix(@angular-devkit/build-angular): allow mts and cts file replac…

[demurgos]

…ement

Updates the fileReplacement pattern to allow .mts and .cts files. This enables support for TypeScript files with explicit ESM support.

Closes #27124

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?

Replacing cts, ctsx, mts, mtsx files is rejected by schema validation while these files are supported by the build script.

Issue Number: #27124

What is the new behavior?

.cts and .mts files are allowed to be replaced.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[clydin]

Thank you for the contribution.
LGTM.

The test failure is unrelated to this change.

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