Add check for ACR registry in ACR credential helper

[codysoyland]

Summary

This PR adds a check that will only run the ACR credential helper when the target registry is a subdomain of azurecr.io.

This is similar to an existing check used for GCR.

Fixes #1657

Release Note

Documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.18%. Comparing base (50ef092) to head (a4d3b49).
Report is 249 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1658       +/-   ##
===========================================
- Coverage   52.92%   42.18%   -10.75%     
===========================================
  Files          44      121       +77     
  Lines        3979     7190     +3211     
===========================================
+ Hits         2106     3033      +927     
- Misses       1651     3802     +2151     
- Partials      222      355      +133     

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[codysoyland]

The original issue seems to be resolved by #1656, which merged earlier today.

I still think this PR is good to merge, as it will speed things along slightly if ACR is not used, but the fix has basically been implemented.

[hectorj2f]

Thanks @codysoyland although there is one CI check failing.