Stop duplicating Scroll code in TreeViewAutomationPeer / forward to base

[h3xds1nz]

Description

Removes 1:1 duplicate code for PatternInterface.Scroll and forwards it to base (specifically, ItemsControlAutomationPeer).

Customer Impact

Cleaner codebase for developers.

Regression

No.

Testing

Local build.

Risk

Low.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 2.98821%. Comparing base (57fe8ac) to head (5fe51ab).
Report is 10 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main     #10883          +/-   ##
===================================================
- Coverage   13.48885%   2.98821%   -10.50064%     
===================================================
  Files           3317       3319           +2     
  Lines         664749     664879         +130     
  Branches       74643      74672          +29     
===================================================
- Hits           89667      19868       -69799     
- Misses        572488     644830       +72342     
+ Partials        2594        181        -2413     

Flag	Coverage Δ
Debug	2.98821% <0.00000%> (-10.50064%)	⬇️

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