Fix wrong run title shown

[rosswhitfield]

Description of the changes

Ref: 6258: [WebMon] Wrong run title shown for HB2C

Everywhere that StatusCache is accessed it is done with .latest("timestamp") except in get_cached_variables. This is why initially the page is correct but gets updated with incorrect information. Really this issue should not happen but I guess it must be possible.

I have changed get_cached_variables to sort by name first then newest timestamp, after which we only use the first appearance of that parameter.

You can check that this works by starting webmon with docker and add in additional run_title StatusCache (http://localhost/database/dasmon/statuscache/) and check that the newest is always used.

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:
• Links to related issues or pull requests:

Manual test for the reviewer

(Instructions for testing here)

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 77.35%. Comparing base (1adc1a6) to head (7f2dafb).

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #188      +/-   ##
==========================================
+ Coverage   77.33%   77.35%   +0.01%     
==========================================
  Files          51       51              
  Lines        4611     4615       +4     
==========================================
+ Hits         3566     3570       +4     
  Misses       1045     1045              

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[backmari]

Tested locally that adding an additional run title in http://localhost/database/dasmon/statuscache/ then the latest run title is the one that is displayed both initially and when the page is automatically updated.