REST API: Add dimension validation to sideload endpoint #26829

Job	Run time
Core running from build / Linux	4m 17s
Core running from src / Linux	4m 21s
Core running from build / MacOS	6m 16s
Core running from src / Windows	7m 23s
Core running from build / Windows	8m 5s
Core running from src / MacOS	4m 50s
Slack Notifications	0s
Failed workflow tasks	0s
	35m 12s

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