CI: Special case porting test in 'sanity check'

Add a special case for the porting test in the sanity check of the
CI run.

Before:
    When a porting test failed (such as t/porting/authors.t,
    t/porting/cmp_version.t, ...) then it would skip all the other
    test configurations.

Now:
    When a porting test fails:
    - result of sanity check is failure (i.e. it's red)
    - other test configurations are run and these will also run the
      porting tests. (These may or may not fail, depending on the test)

    When a non-porting test fails:
    - result of sanity check is failure (i.e. it's red)
    - sanity check still runs the porting tests
    - other test configurations are skipped

Note: in the `if`conditions of the other test configurations it was
      needed to include `always()` because otherwise GitHub uses an
      implicit `success() &&` (which check the result of the
      sanity check - which is unwanted if only the porting tests failed)

Fixes #19867

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