Move the My actions list under Content and render its actions as an operations dropbutton

Follow-up to #3610065.

Moves the "My actions" list out of the user account menu into the admin Content menu as "My Orchestra actions" (columns Process / Step / Action, the Process cell linked to the instance trace), and folds each row's actions into an operations dropbutton (act link first, then a one-click item per directly-signalable outcome), matching the per-instance list column. The shared rendering is extracted into PendingActionLinksTrait used by both surfaces. Presentation and placement only; covered by a new kernel test.

Issue: https://www.drupal.org/project/orchestra/issues/3610387

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