refactor(bazel): Fix warning about overridden tsconfig options

[kyliau]

Under Bazel, some compilerOptions in tsconfig.json are controlled by
downstream rules. The default tsconfig.json causes Bazel to print out
warnings about overriden settings.

This commit makes a backup of the original tsconfig.json and removes
tsconfig settings that are controlled by Bazel.

As part of this fix, JsonAst utils are refactored into separate package
and unit tests are added.

PR closes #28034

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?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

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