fix: don't check exclude if the option wasn't used

In some cases, the empty pattern matches every string. It shouldn't be checked if the option wasn't used.

Improve error message + added exclusion regex

Exclusion regex can be used to skip this test in CI (PRs and MRs)

Added branch-name check

Added a new pre-commit check that verifies brancha names against a given regular expression (passed as a parameter).