fix: route RequestBodyPlainText to request_body_data instead of request_body_json #4661

Job	Run time
Get Changes	4s
Check: source-intercom	4m 32s
Check: destination-motherduck	3m 31s
Check: source-pokeapi	1m 57s
Check: source-hardcoded-records	2m 44s
Check: source-shopify	52m 18s
Skipped Check: source-google-drive	6s
	1h 5m 12s

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