This change provides more fine-grained warnings during the `update-module-and-target-compiler-options` migration for V10.0 in the event a TypeScript configuration file could not be updated. The `JSONFile` utility class was also augmented to directly throw when created to ensure that the `content` property is always initialized.
In tslint version 6, several recommanded rules have been removed in the following PRs:
https://github.com/palantir/tslint/pull/4871https://github.com/palantir/tslint/pull/4312
With this migration we update the tslint depedency to 6+ and add back these rules in the user workspace `tslint.json` also we remove some deprecated rules.
Until version 10, this is an opt-in migration and users will need to run this manually with the below command:
```
ng update @angular/cli --migrate-only tslint-version-6
```
Closes: #17117
Reference: TOOL-1348
