Clean up `deprecate-implicit-route-model` deprecation #10157

Job	Run time
Basic Test	1m 34s
Type Checking (current version)	56s
Linting	1m 4s
Type Checking (other supported versions) (4.9)	1m 14s
Type Checking (other supported versions) (5.0)	1m 5s
Type Checking (other supported versions) (5.1)	1m 13s
Type Checking (other supported versions) (5.2)	1m 4s
Type Checking (other supported versions) (5.3)	1m 2s
Blueprint Tests	5m 2s
Browserstack Tests (Safari, Edge)	6m 2s
All deprecations enabled	1m 29s
Node.js Tests	58s
All deprecations enabled, with optional features	1m 39s
Smoke tests (Full Ember Apps) (classic-basics)	1m 30s
Deprecations as errors	1m 27s
Smoke tests (Full Ember Apps) (embroider-basics)	1m 19s
Deprecations as errors, with optional features	1m 28s
Browser Tests (Firefox)	1m 45s
Production build	1m 39s
Production build, with optional features	1m 25s
Publish alpha from default branch	0s
Deploy tags to npm	0s
Notify Discord	0s
Publish channel to s3	0s
	34m 55s

Provide feedback