Backport of [ui] Fix a bug where redirects after planning/editing a job didn't include namespace into release/1.3.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #13588 to be assessed for backporting due to the inclusion of the label backport/1.3.x.

The below text is copied from the body of the original PR.

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Previously, we treated namespaces like query parameters; however, this caused the onSubmit redirects to 404 when planning a job.

Side-effect: also introduces router service transition instead of depending on the deprecated transitionToRoute method.

Resolves #13039

[github-actions]

Ember Test Audit comparison

	release/1.3.x	578f70a	change
passes	1287	1285	-2
failures	2	2	0
flaky	0	2	+2
duration	000ms	000ms	-000ms

[github-actions]

Ember Test Audit flaky tests

Ember Test Audit detected these flaky tests on 578f70a:

• Acceptance | optimize: lets recommendations be toggled, reports the choices to the recommendations API, and displays task group recommendations serially
• Acceptance | task group detail: facet Status | the Status facet filters the allocations list by Status

[github-actions]

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