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Add `GlFormCharacterCount` component

Peter Hegman requested to merge create-gl-form-character-count-component into main

What does this MR do?

In !4097 (merged) I introduced character count for GlFormTextarea but what I failed to realize is that this implementation won't work for instances where we need to add character count to a markdown field such as /app/assets/javascripts/organizations/shared/components/new_edit_form.vue#L202. This MR refactors the logic to a GlFormCharacterCount component. This component is used internally by GlFormTextarea but can also be used as a standalone component (see example in story markdown docs).

Screenshots or screen recordings

Screen_Recording_2024-05-16_at_5.52.31_PM

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Accessibility

If this MR adds or modifies a component, take a few moments to review the following:

  • All actions and functionality can be done with a keyboard.
  • Links, buttons, and controls have a visible focus state.
  • All content is presented in text or with a text equivalent. For example, alt text for SVG, or aria-label for icons that have meaning or perform actions.
  • Changes in a component’s state are announced by a screen reader. For example, changing aria-expanded="false" to aria-expanded="true" when an accordion is expanded.
  • Color combinations have sufficient contrast.
Edited by Peter Hegman

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