enable embroider tests in ci #887

Job	Run time
Floating Dependencies	1m 12s
Tests	1m 10s
Type checking - typescript-4.2	1m 34s
Type checking - typescript-4.3	1m 33s
ember-lts-4.4	1m 46s
Type checking - typescript-4.4	1m 35s
Type checking - typescript-4.5	1m 33s
ember-lts-4.8	1m 57s
ember-release	1m 48s
Type checking - typescript-next	1m 36s
ember-beta	2m 3s
ember-canary	1m 46s
embroider-safe	1m 54s
embroider-optimized	1m 51s
	23m 18s

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