infra: print log data when Python fuzz_target fails

[correctmost]

Description

This will make it easier to debug coverage failures that are not reproducible locally.

The failure that I am trying to debug:

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=62231
  • https://oss-fuzz-build-logs.storage.googleapis.com/log-c420cf0c-f073-4c42-b75c-422971ef272e.txt

Step #5: Already have image (with digest): gcr.io/oss-fuzz-base/base-runner
Step #5: Entering python fuzzing
Step #5: Error happened getting coverage of fuzz_parse
Step #5: This is likely because Atheris did not exit gracefully

Similar log data is displayed in other blocks:

oss-fuzz/infra/base-images/base-runner/coverage

Lines 101 to 105 in f716590

	timeout $TIMEOUT $OUT/$target $args &> $LOGS_DIR/$target.log
	if (( $? != 0 )); then
	echo "Error occured while running $target:"
	cat $LOGS_DIR/$target.log
	fi

oss-fuzz/infra/base-images/base-runner/coverage

Lines 149 to 153 in f716590

	timeout $TIMEOUT $OUT/$target -test.coverprofile $DUMPS_DIR/$target.profdata &> $LOGS_DIR/$target.log
	if (( $? != 0 )); then
	echo "Error occured while running $target:"
	cat $LOGS_DIR/$target.log
	fi

oss-fuzz/infra/base-images/base-runner/coverage

Lines 206 to 210 in f716590

	timeout $TIMEOUT $OUT/$target $args &> $LOGS_DIR/$target.log
	if (( $? != 0 )); then
	echo "Error occured while running $target:"
	cat $LOGS_DIR/$target.log
	fi

oss-fuzz/infra/base-images/base-runner/coverage

Lines 255 to 260 in f716590

	JAZZERJS_EXTRA_ARGS=$jazzerjs_args $OUT/$target $args &> $LOGS_DIR/$target.log
	if (( $? != 0 )); then
	echo "Error occured while running $target:"
	cat $LOGS_DIR/$target.log
	fi

---

This PR is a continuation of #12405 with a renamed branch to avoid trial-build errors:

ERROR: (gcloud.builds.submit) INVALID_ARGUMENT: invalid build: invalid build tag "testing-cm/display-coverage-log": must match format "^[\\w][\\w.-]{0,127}$"