fix(oauth): add thread-safe token refresh with double-checked locking #4265

Job	Run time
Get Changes	5s
Check: source-hardcoded-records	2m 50s
Check: source-pokeapi	1m 43s
Skipped Check: source-google-drive	5s
Check: source-shopify	48m 43s
Check: destination-motherduck	3m 5s
Check: source-intercom	3m 0s
	59m 31s

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