Add unit tests coverage to application_modules/monitoring_utils.py

[carlosgjs]

See: https://app.codecov.io/gh/noisepy/NoisePy/blob/main/src%2Fnoisepy%2Fseis%2Fapplication_modules%2Fmonitoring_utils.py

Here's how to get coverage locally:

pytest tests --cov --cov-report=html:covrep
open covrep/index.html