Allow more than 2 files to form cache key

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Proposal

Quoting from https://docs.gitlab.com/ee/ci/yaml/README.html#cachekeyfiles:

When you include cache:key:files, you must also list the project files that are used to generate the key, up to a maximum of two files.

The proposal is, basically, to remove such files limit.

There are some possibilities to implement this feature:

1. #272556 could be used to replace this one if fixed.

2. Allow defining several caches, instead of just one per job. Example:

   variables:
     MOLECULE_EPHEMERAL_DIRECTORY: $CI_PROJECT_DIR/.cache/molecule
     POETRY_VIRTUALENVS_IN_PROJECT: "true"
     PRE_COMMIT_HOME: $CI_PROJECT_DIR/.cache/pre-commit
   
   cache:
     - paths:
         - $PRE_COMMIT_HOME
       key:
         prefix: pre-commit
         files:
           - .pre-commit-config.yaml
     - paths:
         - .venv
       key:
         prefix: poetry
         files:
           - pyproject.toml
           - poetry.lock
     - paths:
         - $MOLECULE_EPHEMERAL_DIRECTORY
       key:
         prefix: molecule
         files:
           - tests/molecule/default/collections.yml
           - tests/molecule/default/requirements.yml