add optional branch flag to pipeline delete command

[sj-williams]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.81%. Comparing base (3624992) to head (cb15de6).

❗ Current head cb15de6 differs from pull request most recent head 0d5d3b4. Consider uploading reports for the commit 0d5d3b4 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #549   +/-   ##
=======================================
  Coverage   37.81%   37.81%           
=======================================
  Files          50       50           
  Lines        3165     3165           
=======================================
  Hits         1197     1197           
  Misses       1843     1843           
  Partials      125      125           

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