remove linting from the i18n angular.json example as that is no longer
present in the boilerplace angular.json (and the two should be kept in
sync)
note: the linting was removed from the boilerplate angular.json file in PR #43592
PR Close#43747
Note that because `angular.json` is a "boilerplate" file we cannot
just add comments to the one that is actually used in the application.
Instead this commit makes a copy, which is annotated with docregions.
To ensure that this file is not ignored by the example-collector, we had to
update the `.gitignore` to not ignore this file. (This also allows the file to be
easily stored tracked in git).
PR Close#43216
