Skip 'pending changes' test for automated testing

This code is called via t/porting/authors.t; it basically checks
if there are pending/uncommitted changes and if the author is a known
contributor.

That test doesn't really work too well in combination with Test::Smoke since
that does create some files in the build-directory and may patch some files
(for example patching 'patchlevel.h' to include the commit id).

The end result: on several smokers the t/porting/authors.t test was failing
[because they lack a git config for user+email or because the configured
 name/email is not a known contributor].

Unfortunately Test::Smoke does not set the AUTOMATED_TESTING flag so
detect if Test::Smoke is running by checking for the 'mktest.out' file.

This commit also reverts the temporary work-around that was added in
commit 6c19d6c6d4db446fa9513b7d617134c938c89a4e. (That work-around
didn't cover all cases; there are smokers running with a different name/email
configured then the one in AUTHORS and for those the test still failed with
the temp work-around.)

Fixes #20141

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