Expand project menu
**As** a user of customised OpenProject
**I want to** see attribute custom texts
**so that** enter data for projects more accurately
**Acceptance criteria**
* Create Show a component to trigger the dialog for an attribute help text
* The dialog is primerized
* The trigger is a question mark (?) icon
after label text for project attributes configured with help texts.
* Clicking on the question mark icon should open a popover that displays the full help text.
* The (?) icon should be rendered with Primer colours.
**Technical notes**
* Hook into the Icons will be updated to use Octicons.
* Colours will be updated to confirm to Primer form builder to automatically design system.
**Open questions**
* Explore how we show the question mark as part of the label when an element of the form has an attribute help text configured.
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