Workspace context implementations should call this at the point where the
user has committed to the action (e.g. after a confirmation modal has
resolved with a positive result) so that callers can surface in-flight UI
only while real work is about to begin.
Invokes the
onActionStartingcallback from UmbWorkspaceActionExecutionOptions when present, otherwise a no-op.Workspace context implementations should call this at the point where the user has committed to the action (e.g. after a confirmation modal has resolved with a positive result) so that callers can surface in-flight UI only while real work is about to begin.