Bump ember-cli from 4.12.3 to 6.2.2 #10413

Job	Run time
Type Checking (current version)	1m 9s
Linting	1m 17s
Basic Test	1m 24s
Type Checking (other supported versions) (5.1)	1m 6s
Type Checking (other supported versions) (5.6)	1m 6s
Type Checking (other supported versions) (5.0)	1m 0s
Type Checking (other supported versions) (5.7)	1m 8s
Type Checking (other supported versions) (5.4)	1m 9s
Type Checking (other supported versions) (5.2)	1m 3s
Type Checking (other supported versions) (5.5)	59s
Type Checking (other supported versions) (5.3)	1m 8s
Blueprint Tests	1m 55s
Browserstack Tests (Safari, Edge)	4m 51s
All deprecations enabled, with optional features	1m 18s
Smoke tests (Full Ember Apps) (embroider-basics)	1m 28s
Deprecations as errors	1m 33s
Browser Tests (Firefox)	1m 41s
Production build, with optional features	1m 18s
Production build	1m 22s
Node.js Tests	51s
All deprecations enabled	1m 15s
Smoke tests (Full Ember Apps) (classic-basics)	1m 17s
Deprecations as errors, with optional features	1m 16s
Publish channel to s3	0s
Notify Discord	0s
Publish alpha from default branch	0s
Deploy tags to npm	0s
	32m 34s

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