fix: #3624847 Name the workflow list in the Orchestra admin menu

The Orchestra administration menu item is not a section heading. Modeler API derives it from the model owner and points it at entity.orchestra_workflow.collection, the workflow list itself. Every other Orchestra link hangs off it, so the menu renders it as a heading and the only way into the list is to click that heading. Import is one of those children, which offers the importer while leaving out the collection it imports into.

A Workflows link under the same parent names the destination, weighted above the Import and Settings children Modeler API derives without a weight.

It repeats its parent's route, so on the collection page both the parent and the child are in the active trail. That is the trade for a destination the menu names rather than one reachable only by clicking a heading.

No new test. The property a test can catch here is the one MenuLinkRootingTest already sweeps every *.links.menu.yml for — a link parented on another module's item has to name its own menu, which this one does, and that sweep passes. Asserting that a menu link exists would only pin the change to itself.

The menu description is translatable, so its French is added in the same change.

Out of scope, recorded on the issue: the local task tab on these pages reads "Models", which is hardcoded in Modeler API's local task deriver rather than taken from the model owner, so it is not this project's to change.