Upgrade Ember to v5.5.0 #486

Job	Run time
Tests	1m 18s
Floating Dependencies	1m 11s
Build Tests	2m 24s
Scenario: ember-lts-4.4 \| optional: false	2m 59s
Scenario: ember-lts-4.8 \| optional: false	2m 56s
Scenario: ember-lts-4.12 \| optional: false	2m 57s
Scenario: ember-release \| optional: false	3m 21s
Scenario: ember-beta \| optional: false	3m 7s
Scenario: ember-classic \| optional: false	3m 15s
Scenario: ember-canary \| optional: true	2m 56s
Scenario: embroider-safe \| optional: true	3m 1s
Scenario: embroider-optimized \| optional: true	2m 56s
	32m 21s

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