fix(breadcrumbs): link executions to the workflow that ran

[1fanwang]

TL;DR

An execution launched through a differently named launch plan links its breadcrumb to
a workflow that does not exist.

Before this change, a launch plan named hello_world_lp for workflow
hello_world_wf shows and links the launch-plan name. After this change, the breadcrumb
shows and links the workflow that actually ran.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added. Not applicable: no public API changed.
• Any pending items have an associated Issue. No pending items.

Complete description

Build the breadcrumb from the executed workflow identity instead of the launch-plan
identity. The label becomes "Workflow Name."

Manual check:

1. Register launch plan hello_world_lp for workflow hello_world_wf.
2. Launch it and open the execution page.
3. Click the "Workflow Name" breadcrumb.

Before this change, the breadcrumb shows hello_world_lp and opens an empty workflow
page. With this change, it shows hello_world_wf and opens that workflow. Regression
tests cover workflow and task executions.

The focused domain correction from #939
is now on master. The regression separates execution, launch-plan, workflow, and
browsing identities so the final URL proves every route field comes from the executed
workflow.

Tracking Issue

N/A

Follow-up issue

N/A