Catch xml.etree.ElementTree ParseError exception from an invalid XML file

[oharan2]

Context:
If the test results file contains a broken XML content, the junitparser command will fail with a:
xml.etree.ElementTree.ParseError: syntax error: .. failure.

See job failure example: https://prow.ci.openshift.org/view/gs/test-platform-results/logs/periodic-ci-mtc-qe-mtc-e2e-qev2-master-mtc1.8-ocp4.15-lp-interop-mtc-interop-aws/1756921885850865664#1:build-log.txt%3A93

This happens especially when we modify the test results with replacing it's content with a string contains:
"This file contained potentially sensitive information and has been removed.\\n"

REF:
https://redhat-internal.slack.com/archives/C04PK4QPSR1/p1707747454327419

[redhat-qe-bot]

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[calebevans]

@oharan2 if you run "make pre-commit" in the root of the repo, it should fix the errors or tell you what to fix :)

[calebevans]

/lgtm

[oharan2]

/verified