Remove SDF polygon clipping from Globe

[mzschwartz5]

Description

This PR simply removes now-unused code from the Globe classes / shaders related to SDF-based polygon clipping (since down-stack PRs have reimplemented Globe polygon clipping on the vector pipeline).

Issue number and link

None

Testing plan

Regression testing -- follow same testing plan as in #13637

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have updated the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

AI acknowledgment

• I used AI to generate content in this PR
• If yes, I have reviewed the AI-generated content before submitting

If yes, I used the following Tools(s) and/or Service(s):

If yes, I used the following Model(s):

PR Dependency Tree

• PR Clipping polygon buffer migration #13623
  • PR Vector Textures for Polygon Clipping #13635
    • PR Clipping texture plumbing #13636
      • PR Shader rework for terrain polygon clipping #13637
        • PR Remove SDF polygon clipping from Globe #13638 👈
          • PR Model clipping rework foundation #13641
            • PR Model polygon clipping shader impl #13647
              • PR Remove polygon clipping sdf path #13654
                • PR Clipping Polygon Holes #13660
                  • PR ClippingPolygon immutable positions (performance) #13665

This tree was auto-generated by Charcoal

[github-actions]

Thank you for the pull request, @mzschwartz5!

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