DM-37083: Update dimensions config to version 3

[andy-slac]

Extend size of the observation_reason column in visit and exposure tables.

Checklist

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

[codecov]

Codecov Report

Base: 85.33% // Head: 85.33% // No change to project coverage 👍

Coverage data is based on head (111f45e) compared to base (c9c437b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #757   +/-   ##
=======================================
  Coverage   85.33%   85.33%           
=======================================
  Files         260      260           
  Lines       34535    34535           
  Branches     5813     5813           
=======================================
  Hits        29469    29469           
  Misses       3823     3823           
  Partials     1243     1243           

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