upgrade Ember CLI and blueprints to v4.4 (#684) #6

Job	Run time
lint javascript	1m 13s
lint ember templates	1m 21s
Test php backend (7.2)	22s
test against additional browser in BrowserStack	2m 44s
Test php backend (7.3)	16s
test against Chrome	2m 22s
Test php backend (7.4)	23s
test bundlesize	2m 58s
test CSP in .htaccess	1m 9s
Test php backend (8.0)	18s
Test php backend (8.1)	20s
test against Firefox	2m 35s
Test php backend (8.2)	16s
	16m 17s

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