Summary: Dropdown elements should have associated labels per https://www.w3.org/WAI/tutorials/forms/labels/ Setting the JS tooltips for the "Manage" and "Fullscreen" dropdowns also as their `aria-label` is clearly more accessible than exposing no hints at all. Regarding the implemention, * `$action->getName()` would return null as no name is set to be rendered in the UI next to the icon. * introducing `$action->getTooltip()` in `PHUIListItemView` would also return null as this tooltip is created via JavaScript in `PhabricatorProjectBoardViewController` via `PHUIListItemView()->setMetadata()`. Thus do the ugly dance by parsing that very metadata for the sake of more accessibility on project workboards. Ref T16072 Test Plan: Go to a project workboard, inspect the HTML of the two buttons in the upper right corner for "Manage" and "Fullscreen", see an `aria-label` in the HTML code, have happier screenreader users who appreciate links which have a discernible name. Reviewers: O1 Blessed Committers, chris Reviewed By: O1 Blessed Committers, chris Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T16072 Differential Revision: https://we.phorge.it/D26050