tests: Filter out TMT's verbose DEBUG logging in CI

TMT's queue/worker implementation (used for parallel provisioning) emits
DEBUG-level log messages using Python's standard logging format that bypass
TMT's normal formatting and filtering. These messages appear as:
  DEBUG:tmt.run.logger0.provision.provision.queue: ...

This results in over 100,000 lines of debug output in CI runs, making logs
difficult to read and consuming significant storage.

The DEBUG output:
- Uses Python's default logging format, not TMT's custom formatter
- Appears regardless of TMT's -v or -d flags
- Comes from TMT's internal queue worker threads during provision steps
- Contains messages like "memory: set to '2048 MB' because of no constraints"

This fix filters out these Python logging DEBUG lines while preserving:
- TMT's normal formatted output (test results, progress, etc.)
- Actual test output and errors
- INFO, WARNING, and ERROR level messages

The root issue should be reported upstream to TMT as the queue logger
should respect TMT's debug_level settings.

Assisted-by: Claude Code (Sonnet 4.5)

Author: cgwalters

tests/run-tmt.sh

@@ -23,5 +23,11 @@ rm -vrf /var/tmp/tmt/testcloud/images/bootc-integration-test.qcow2
 
 cd target/tmt-workdir
 # TMT will rsync tmt-* scripts to TMT_SCRIPTS_DIR=/var/lib/tmt/scripts
-# running_env=image_mode means running tmt on image mode system on Github CI or locally
-exec tmt --context "test_disk_image=${DISK}" --context "running_env=image_mode" run --all -e TMT_SCRIPTS_DIR=/var/lib/tmt/scripts "$@"
+# running_env=image_mode means running tmt on image_mode system on Github CI or locally
+#
+# Filter out verbose DEBUG lines from TMT's internal queue logging.
+# TMT's queue/worker implementation emits DEBUG-level Python logging messages
+# that bypass TMT's normal formatting. These add 100k+ lines of noise in CI logs.
+# We filter lines matching "DEBUG:tmt.*:" while preserving TMT's formatted output
+# and actual test results.
+exec tmt --context "test_disk_image=${DISK}" --context "running_env=image_mode" run --all -e TMT_SCRIPTS_DIR=/var/lib/tmt/scripts "$@" 2>&1 | grep -v "^DEBUG:tmt\."