Break up LastTest.log of /static-checks/rpmbuild-ctest

[comps]

The log can be several MBs (typically 6-8MB) and contains results for all tests executed, even passed ones.

Modify the test to provide a sectioned-off log file for each of the sub-results, like /per-rule does, so that logs for passed tests can be discarded if needed.

Ie. instead of ctest_results, iterate directly over LastTest.log, matching on sections like

18/43 Testing: test-generate_contributors
18/43 Test: test-generate_contributors
Command: "/usr/bin/env" "PYTHONPATH=/root/content:../.." "/usr/bin/python3" "/root/content/utils/generate_contributors.py" "--dry-run"
Directory: /root/content/build/tests
"test-generate_contributors" start time: Aug 17 23:18 CEST
Output:
----------------------------------------------------------

as a starting barrier, and

<end of output>
Test time =   0.02 sec
----------------------------------------------------------
Test Passed.
"test-generate_contributors" end time: Aug 17 23:18 CEST
"test-generate_contributors" time elapsed: 00:00:00
----------------------------------------------------------

as the ending barrier, extracting test name, pass/fail/etc. from it, and submitting any test output between the barriers as a log file to results.report().