Remove now unused CATALOG_ID and CATALOG_SECRET

[rosswhitfield]

Description of the changes

WebMon was actually moved to using the API token in #195, this just cleans up the remaining parts.

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:
  8192: [WebMon] Change ONCat authentication method to API token

• 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 77.78%. Comparing base (5d250e6) to head (41e7b14).

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #197      +/-   ##
==========================================
- Coverage   77.79%   77.78%   -0.02%     
==========================================
  Files          54       54              
  Lines        4711     4708       -3     
==========================================
- Hits         3665     3662       -3     
  Misses       1046     1046              

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[backmari]

Thank you!