Add workflow to update RMS models

[FedericoNegri]

Add an automated workflow that:

• starts up the HPS services (latest-dev)
• downloads the RMS open api spec
• regenerates RMS pydantic models
• creates a PR if there's any change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.50%. Comparing base (353ad88) to head (9ddefad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #580   +/-   ##
=======================================
  Coverage   87.50%   87.50%           
=======================================
  Files          65       65           
  Lines        2897     2897           
=======================================
  Hits         2535     2535           
  Misses        362      362           

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