Ignore .pymon-journal file in test discovery

[valeriupredoi]

Description

Sister PR to Tool's ESMValGroup/ESMValTool#2491 that was a result from issue ESMValGroup/ESMValTool#2489 - thanks to @zklaus for noticing this and fixing it in Tool, his description:

Sometimes (relatively frequently), the monitor tests fail because pytests discovery stumbles over what looks like a temporary file from pytest-monitor. This PR adds an explicit ignore for that file.

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Codecov Report

Merging #1436 (818f4dd) into main (6b119db) will not change coverage.
The diff coverage is n/a.

❗ Current head 818f4dd differs from pull request most recent head 322e338. Consider uploading reports for the commit 322e338 to get more accurate results

@@           Coverage Diff           @@
##             main    #1436   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
=======================================
  Files         196      196           
  Lines       10336    10336           
=======================================
  Hits         9267     9267           
  Misses       1069     1069           

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[zklaus]

Thanks for porting it to the core, @valeriupredoi! Once the tests are green, the branch can be removed from the triggering and it's ready.

[valeriupredoi]

cheers @zklaus 🍺