feat: add qunit config #785

Job	Run time
Floating Dependencies	1m 22s
Tests	59s
ember-lts-4.4	1m 32s
ember-lts-4.8	1m 32s
Type checking - typescript-4.2	1m 21s
ember-release	1m 36s
Type checking - typescript-4.3	1m 23s
ember-beta	1m 48s
Type checking - typescript-4.4	1m 22s
Type checking - typescript-4.5	1m 22s
ember-canary	1m 35s
Type checking - typescript-next	1m 18s
embroider-safe	1m 28s
embroider-optimized	1m 30s
	20m 8s

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