Fixed excluded substring patterns in log_file_checks.py that have backslashes…

[bieryAtFnal]

… to be raw strings

Description

Earlier today, Michal reported that he noticed messages like the following when running regression tests like minimal_system_quick_test with the latest nightly build:

=============================== warnings summary ===============================
.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:111
  /home/nfs/biery/dunedaq/03AugFDDevTest730_1552/.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:111: SyntaxWarning: invalid escape sequence '\s'
    ["LogLevel=error", "key:\s\"DUNEDAQ_ERS_"]

.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:114
  /home/nfs/biery/dunedaq/03AugFDDevTest730_1552/.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:114: SyntaxWarning: invalid escape sequence '\s'
    ["LogLevel=error", "key:\s\"DUNEDAQ_ERS_", "DUNEDAQ_ERS_.*erstrace", "export DUNEDAQ_ERS_",

.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:115
  /home/nfs/biery/dunedaq/03AugFDDevTest730_1552/.venv/lib/python3.12/site-packages/integrationtest/log_file_checks.py:115: SyntaxWarning: invalid escape sequence '\['
    "NewConnectionError.* Failed to establish a new connection: \[Errno 111\] Connection refused"]

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================== 3 passed, 3 warnings in 59.57s ========================

It seems that this problem can only be seen when the first integtest is run after a new local software area is created. That's pretty weird, but I believe that the problem originated when I added extra "excluded substrings" to log_file_checks.py.

This PR has improvements in the way that the excluded substrings are declared, and I'm hopeful that these changes will eliminate the messages that Michal reported.

I've confirmed that a sampling of regression tests continues to run normally with these changes.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Testing checklist

• Full set of integration tests pass (dunedaq_integtest_bundle.sh)

[jcfreeman2]

Approved. In two separate terminals, I set up two separate work areas. In the first one, I built the develop branch of integrationtest and got ======================== 4 passed, 3 warnings in 57.82s ======================== for the MSQT. In the other, I built this feature branch, and just got ============================== 4 passed ✅ in 57.71s ==============================.