DM-43430: Add SLAC RSP to RemoteButler whitelist

[dhirving]

Butler server is now deployed at USDF, so add it to RemoteButler's authentication whitelist to allow it to work from notebooks.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (114d8ba) to head (976e08f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #981   +/-   ##
=======================================
  Coverage   88.92%   88.92%           
=======================================
  Files         329      329           
  Lines       42331    42331           
  Branches     8702     8702           
=======================================
  Hits        37642    37642           
  Misses       3439     3439           
  Partials     1250     1250           

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