Avoid unnecessary delegate/closure allocations in UIElementAutomationPeer

[h3xds1nz]

Fixes #10676

Description

Avoids unnecessary delegate/closure allocations in UIElementAutomationPeer by passing the argument via ref instead for this recursive iterator function, allowing to use a static lambda instead.

I've also used the instance over static factory method for CreateAutomationPeer to avoid the unnecessary null check that we've performed right before calling this method, further improving perf on this hot path.

Since the implementation is same for UIElement3DAutomationPeer, I've shared it.

Customer Impact

See #10676 for impact of this change.

Regression

No.

Testing

Local build, verifying that peers are still created.

Risk

Low.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.

Project coverage is 11.37708%. Comparing base (4aff730) to head (3d5663b).
Report is 5 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #10691         +/-   ##
===================================================
+ Coverage   11.28308%   11.37708%   +0.09399%     
===================================================
  Files           3353        3354          +1     
  Lines         668062      668001         -61     
  Branches       74980       74975          -5     
===================================================
+ Hits           75378       75999        +621     
+ Misses        591433      590754        -679     
+ Partials        1251        1248          -3     

Flag	Coverage Δ
Debug	11.37708% <0.00000%> (+0.09399%)	⬆️

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