Issue #3172956: Add contextual trigger to theme function

Kieran Cottrequested to merge
issue/drupal-3172956:3172956-theme-function-contextual-trigger-txt into main
  • Added Drupal.theme.contextualTriggerText .
  • Routed contextual trigger text through the theme function.
  • Removed the screen-reader-specific wording per comment #9.
  • Adapted the historical patch to the current consolidated JavaScript structure.

Closes #3172956

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