Remove junit test result processor

This has some problems, namely that it gets confused as to what workflow
run to add results to. Related issue:
EnricoMi/publish-unit-test-result-action#12
This seems to be a shortcoming of the github API:
https://github.community/t/specify-check-suite-when-creating-a-checkrun/118380/7

Signed-off-by: Brian Goff <[email protected]>