add option to exclude files from linting with super-linter

[juleshaas]

This MR adds the option to exlcude files from linting with super-linter in repos, where the reusable workflow is used.

To exclude files from linting with super-linter add them to the linting.yml in the corresponding repo, like:

jobs:
  lint:
    uses: mundialis/github-workflows/.github/workflows/linting.yml@main
    with:
      FILTER_REGEX_EXCLUDE: ".*processing/templates/template_MAIN_loop.json"

Attention: This skips the whole file during linting with super-linter! Other linters still apply.

[mmacata]

Useful feature, thank you!
I added some suggestions to make it more obvious that no python linting is affected or python file could be excluded and also to prefer more specific excludes if possible.

[juleshaas]

Good idea, thanks. I added the suggestions and tested again successfully.