Rename HeadingAccessibilityFilter and add pipeline test coverage

Asherah Connorrequested to merge
duo/fix/603948-heading-localization-filter into master

What does this MR do and why?

Implements the follow-up work from #603948; used to test workplans (on that issue) and Duo Developer.

  • Closes the test gap pointed out in the !241282 (merged) review.
  • Renames HeadingAccessibilityFilter to make more sense.

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Edited by Asherah Connor

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