Alan Agius c5b3e92991 refactor(@angular-devkit/core): deprecate unused exception classes
With this change we deprecate exception classes that are not used in the CLI repo.

DEPRECATED:

- `ContentHasMutatedException`, `InvalidUpdateRecordException`, `UnimplementedException` and `MergeConflictException` symbol from `@angular-devkit/core` have been deprecated in favor of the  symbol from `@angular-devkit/schematics`.
- `UnsupportedPlatformException` - A custom error exception should be created instead.
2022-03-30 17:17:04 +02:00
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