Update embroider monorepo to v4 #2918

Job	Run time
Tests	25s
Ember Compat: ember-qunit: 4 \| Embroider: true	26s
Ember Compat: ember-qunit: 5 \| Embroider: false	27s
Ember Compat: ember-qunit: 4 \| Embroider: false	23s
Release	0s
	1m 41s

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