ROX-29757: Update Slack pipeline links to pipelineruns to new UI (backport release-3.23)

[tommartensen]

Backport of #2761

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.60%. Comparing base (7c0118b) to head (8c7c379).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-3.23    #2764   +/-   ##
=============================================
  Coverage         27.60%   27.60%           
=============================================
  Files                95       95           
  Lines              5422     5422           
  Branches           2523     2523           
=============================================
  Hits               1497     1497           
  Misses             3213     3213           
  Partials            712      712           

Flag	Coverage Δ
collector-unit-tests	27.60% <ø> (ø)

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