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 Close#30877
Keen Yee Liau
Alex Eagle