Change exit to return in CI tests

Changing in the /example/ files all the exit() statements to return or exception+catch in main, so that resources are cleaned up properly when exiting tests.

assigned to @fzahn

added 7 commits

• 94e68364...88e2cbac - 6 commits from branch 4.2.x
• 54e54a64 - Merge branch '4.2.x' into 'ChangeExitToReturn'

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changed title from Change exit to return to Change exit to return in CI tests

closed