New Dashboard Primitive - Headings (#30804)

* initial prototype commit

* add default value for text cards

* auto focus text/heading cards on creation

* remove default value - use placeholders instead

* fix inability to edit when there is no heading value

* remove unnecessary comment

* re-word heading & text tooltip

* refactor and fix draggable area bug

* fix border artifacts when combined with dragging styling

* fix stroke width for hovering and focused - make them the same

* display placeholder value in editing mode if content is empty for text and heading dash-cards

* remove duplicate placeholders

* allow pointer-events anywhere on the div (not just content)

* refactor styling to apply no content borders

* Fix heading overflow

* refactor text dash-card button

- remove unnecessary redux store usage

* refactor border styling to one css format

* rename class names to match syntax conventions

* refactor auto-preview styling for dash-card root

* refactor style name

* remove comment

* undo unnecessary re-formatting

* refactor popover styling

* remove comment that was previously addressed

* refactor to typescript

* remove comment

* remove un-used code

* fix TypeScript errors in text unit spec

* update button key and event description

* add e2e tests for text and heading dash-cards

* add e2e tests

* add small heading unit tests

* fix typescript error

* add aria-label removed by merging with master

* fix broken test

* fix broken tests

* fix typescript errors

* align edit text with preview text

* change from hover editing to click editing

* update tests for click editing

- remove hover tests
- change focus tests to click tests
- remove top-level findByText() calls

* refactor to use-focus hook

* add "heading" to getSupportedCardsForSubscriptions

* rename showVisualizationOptions to showDashcardVisualizationSettings

* add aria label to buttons and query in tests by label

* refactor E2E tests to make longer flows

* add existing metabase types to Heading

* refactor heading and text menu to use EntityMenu

* fix aria-label

* [skip ci] fix css syntax error from missing semi-colon

* adjust styles and use rem value standards

* [skip ci] prevent drag on click to edit surface area

* tweak styles for mobile resolutions

* fix react import lint error

* fix E2E tests

* refactor e2e helper to shorthand

* refactor to use e2e helper

* refactor to use saveDashboard() e2e helper

* refactor e2e tests

* rename styling variables

* null coalesce minWidth

* remove unnecessary anonymous function wrapping

* refactor to useToggle

* improve no content check

* use object creation shorthand

* simplify expression

* refactor empty content styling

* move text-edit-container styling into heading and text components

* refactor resize handle styling and abstract condition into function

* refactor to use CSS function for string styling

* improve Heading unit tests

* improve Text unit tests

* update Heading and Text unit tests

* update for new Icons

* fix E2E tests

* refactor E2E test assertions

* refactor click events to use user-event library

* fix tooltip positioning