Update embroider monorepo to v4 #2900

Job	Run time
Tests	27s
Ember Compat: ember-qunit: 4 \| Embroider: true	22s
Ember Compat: ember-qunit: 5 \| Embroider: false	26s
Ember Compat: ember-qunit: 4 \| Embroider: false	20s
Release	0s
	1m 35s

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