Fix metadatable type in poly_metadata relationship on Well

[yoldas]

Closes #

Changes proposed in this pull request

• Overrides the autogenerated poly_metadata method to pick the type correctly

Instructions for Reviewers

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[Feature Branches] - Review code
[Production Merges to main]
    - Check story numbers included
    - Check for debug code
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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.31%. Comparing base (b010f3a) to head (86a6c10).
Report is 2 commits behind head on migrating-to-number-of-pools-epic.

Files with missing lines	Patch %	Lines
app/models/well.rb	66.66%	1 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                          @@
##           migrating-to-number-of-pools-epic    #4582      +/-   ##
=====================================================================
+ Coverage                              89.29%   89.31%   +0.02%     
=====================================================================
  Files                                   1407     1407              
  Lines                                  30181    30185       +4     
=====================================================================
+ Hits                                   26950    26961      +11     
+ Misses                                  3231     3224       -7     

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