fix(bazel): do not modify tsconfig.json

[kyliau]

Before this change, user's tsconfig.json is cloned and some options
controlled by Bazel are removed otherwise Bazel would complain about:

WARNING: your tsconfig.json file specifies options which are overridden by Bazel:
 - compilerOptions.target and compilerOptions.module are controlled by downstream dependencies, such as ts_devserver
 - compilerOptions.typeRoots is always set to the @types subdirectory of the node_modules attribute
 - compilerOptions.rootDir and compilerOptions.baseUrl are always the workspace root directory

Since the warning has been removed in rules_typescript/8d8d398, there's no
need to clone and backup tsconfig.json

PR Closes #30104

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

[kyliau]

@alexeagle This is now good to go, @bazel/typescript 0.31.1 has been released.

[alexeagle]

opt: update https://next.angular.io/guide/bazel#removing-bazel too

[AndrewKushnir]

@kyliau merging this PR to patch branch failed due to some conflicts. I've changed the label to "master-only" and merged it to master. Could you please create a separate PR and target patch branch? Thank you.

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