fix(storeapi): Allows fallback to the old API for JWT generation #1979

Job	Run time
Flutter integration tests (windows)	8m 21s
C++ Quality Checks	2m 43s
Flutter Quality checks (ubuntu, p4w_ms_store)	1m 52s
Flutter Quality checks (ubuntu, ubuntupro)	3m 33s
Flutter Quality checks (windows, p4w_ms_store)	2m 50s
Run Go tests with mocks (ubuntu, windows-agent)	4m 47s
Go Quality checks (ubuntu, agentapi)	2m 6s
Flutter Quality checks (windows, ubuntupro)	5m 6s
Go Quality checks (ubuntu, contractsapi)	39s
Run Go tests with mocks (ubuntu, wsl-pro-service)	3m 3s
Go Quality checks (ubuntu, mocks)	1m 26s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	2m 58s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	56s
Run Go tests with mocks (windows, windows-agent)	3m 55s
Go Quality checks (ubuntu, windows-agent)	1m 7s
Run Go tests with mocks (windows, common)	1m 53s
Go Quality checks (ubuntu, wsl-pro-service)	1m 7s
Go Quality checks (ubuntu, common)	1m 8s
Go Quality checks (windows, agentapi)	5m 55s
Go Quality checks (windows, contractsapi)	3m 12s
Go Quality checks (windows, mocks)	4m 45s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	4m 28s
Go Quality checks (windows, windows-agent)	5m 30s
Go Quality checks (windows, end-to-end)	3m 56s
Go Quality checks (windows, common)	3m 47s
	1h 21m 3s

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