Fix segfault-failing tests not getting picked up as failing checks in report

[cgokmen]

Currently, if a test fails with a segfault etc. that prevents the writing of the report, this line doesnt catch it:

OmniGibson/.github/workflows/tests.yml

Line 73 in be687a4

if grep -Eq 'failures="[1-9][0-9]*"|errors="[1-9][0-9]*"' ${{ matrix.test_file }}.xml; then

And there's nothing preventing the report from succeeding when certain tests DONT have outputs.

So if our tests fail hard enough they just disappear from the list of tests :(

[cgokmen]

FYI @ChengshuLi @cremebrule