Highlight invalid testing output in suite_report.py

It has been suggested that the warnings about uncommitted changes in `suite_report.py` should be highlighted in a more obvious way, possibly using coloured text?

Start by reading suite_report.py and locate where warnings about uncommitted changes are produced. Make those warnings visually more obvious, then verify that the invalid testing output is clearly highlighted without changing the warning content.

Written by the indexing model from the issue text.