feat(metadata): add CLI validation with URL-based schema loading #4042

Job	Run time
Get Changes	3s
Check: source-shopify	45m 1s
Check: source-hardcoded-records	2m 35s
Check: source-intercom	3m 2s
Skipped Check: source-google-drive	4s
Check: source-pokeapi	2m 12s
Check: destination-motherduck	3m 16s
	56m 13s

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