skip cleanup of not_used.txt in CI context

[fbenke-pik]

This PR skips any adjustments of not_used.txt when running when codeCheck is executed as part of the Github Actions.

See also: https://github.com/pik-piam/gms/issues/85

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 41.65%. Comparing base (6c17ae3) to head (0800f3f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #90 +/- ## ======================================= Coverage 41.65% 41.65% ======================================= Files 51 51 Lines 1707 1707 ======================================= Hits 711 711 Misses 996 996 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[orichters]

Can we use the same setting for running make test in REMIND as well?

[orichters]

@fbenke-pik: I think a better way would be to do all sorts of removals only in interactive = TRUE mode. That excludes codeCheck in github actions anyway, but we can also switch that simply off in the tests and we are some steps further.

[fbenke-pik]

Will probably be closed in favour of https://github.com/pik-piam/gms/pull/91

[orichters]

I would still merge this one as well. I think github actions should not tinker with the sources in order to satisfy codeCheck. Like this, you also have a good test whether people actually commit and push the changes make check-fix has applied.

[tscheypidi]

Why not link this to the interactive argument as this one is specifically targeted at fixing issues? interactive = TRUE try to live fix some issues, interactive = FALSE no issue fixing?

[fbenke-pik]

Right, Oliver probably will do exactly that in the near future.

[orichters]

Closed in favor of https://github.com/pik-piam/gms/pull/92