Drop unused internal property

[martintmk]

Details on the issue fix or feature implementation

Could fix coverage issues in #1144

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (a7cb07c) 83.93% compared to head (3e5b81b) 83.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1532      +/-   ##
==========================================
- Coverage   83.93%   83.92%   -0.02%     
==========================================
  Files         279      279              
  Lines        6523     6518       -5     
  Branches     1017     1017              
==========================================
- Hits         5475     5470       -5     
  Misses        839      839              
  Partials      209      209              

Flag	Coverage Δ
linux	83.92% <100.00%> (-0.02%)	⬇️
macos	83.92% <100.00%> (-0.02%)	⬇️
windows	83.92% <100.00%> (-0.02%)	⬇️

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Files Changed	Coverage Δ
....Core/Registry/RegistryPipelineComponentBuilder.cs	100.00% <100.00%> (ø)

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