Adds a btn-icon class
What does this MR do?
Not a lot. It just adds a CSS helper class for an icon button in EE. Related discussion.
It's a stop-gap till we refactor the buttons and avoid a lot of the nonsense outlined in #46152 (moved) and our various shades of gray for icon buttons.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.