refactor(@angular/cli): convert quicktype_runner to ts

[santoshyadavdev]

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• [x] 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)
• [x] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

What is the current behavior?

The file had a TODO This file is pure JavaScript because Bazel only support compiling to ES5, while quicktype is ES2015. Now bazel supports 2015 as per config

Issue Number: N/A

What is the new behavior?

Migrate the file to typescript

Does this PR introduce a breaking change?

• [ ] Yes
• [ ] No

Other information

[santoshyadavdev]

I know this will have more work, opening the PR to get some feedback

[alan-agius4]

Happy to accept a PR that changes this to TypeScript. Although truth to be told, there is very little benefits of adding converting this.

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