fix(cdk): support start_date format without microseconds in file-based connectors #4515

Job	Run time
Get Changes	6s
Check: source-intercom	44s
Check: source-pokeapi	49s
Check: source-shopify	43s
Check: source-hardcoded-records	44s
Check: source-google-drive	42s
Check: destination-motherduck	43s
	4m 31s

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