DM-38779: Remove the pipe_base special branch request

[timj]

This reverts commit b5110ba. It was never meant to be merged.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 69.23% and project coverage change: +0.21 🎉

Comparison is base (9747dac) 84.20% compared to head (40d04b2) 84.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
+ Coverage   84.20%   84.41%   +0.21%     
==========================================
  Files          50       50              
  Lines        4627     4621       -6     
  Branches      826      826              
==========================================
+ Hits         3896     3901       +5     
+ Misses        541      531      -10     
+ Partials      190      189       -1     

Impacted Files	Coverage Δ
python/lsst/ctrl/mpexec/cli/script/run.py	45.45% <0.00%> (ø)
python/lsst/ctrl/mpexec/singleQuantumExecutor.py	69.05% <0.00%> (ø)
tests/test_executors.py	92.58% <100.00%> (ø)

... and 2 files with indirect coverage changes

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