Introduce webmonchow

[jmborr]

Description of the changes

Substitute services amq_test_gen and amq_pv_gen with service webmonchow, and update the documentation.

Check all that apply:

• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• (If applicable) Verified that manual tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items: 5986
• Links to related issues or pull requests:

Manual test for the reviewer

Deploy locally and verify the web monitor works

Check list for the reviewer

• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.10%. Comparing base (c59e7a3) to head (5f3a7a4).
Report is 5 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #176   +/-   ##
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  Coverage   77.10%   77.10%           
=======================================
  Files          50       50           
  Lines        4626     4626           
=======================================
  Hits         3567     3567           
  Misses       1059     1059           

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[backmari]

The PR replaces two docker containers used by the system tests Dockerfile.amq_test_gen and Dockerfile.pv_test_gen with the new test fixture container defined in Dockerfile.webmonchow.
I can stand up the local developer environment from the docker-compose.yml and WebMon works as expected. The PV:s are updated for ARCS, HYSA and REF_M and the status of DASMON is green for the instruments.
I was able to change the templated autoreduction configuration for REF_M at http://localhost/reduction/ref_m/ and the parameter changes were reflected in the autoreduction script in the autoreducer container.