[Backport 2.12] Include server.basepath config in the manage notifications channel Url

[opensearch-trigger-bot[bot]]

Backport 1ac71bc83d53b8f03f6b8bfaf2b5f5a442d13880 from #914.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 48.73%. Comparing base (86dfb87) to head (4aafb31).

Additional details and impacted files

@@            Coverage Diff             @@
##             2.12     #918      +/-   ##
==========================================
- Coverage   48.74%   48.73%   -0.02%     
==========================================
  Files         236      236              
  Lines        6839     6843       +4     
  Branches      995      995              
==========================================
+ Hits         3334     3335       +1     
- Misses       3502     3505       +3     
  Partials        3        3              

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[riysaxen-amzn]

some cypress tests are failing, could you check?

[amsiglan]

some cypress tests are failing, could you check?

Need to update the workflow file, let me do it