fix(ci): Fix flutter versioning to no longer use GitHub JSON tricks (… #2322

Job	Run time
Go Quality checks (ubuntu, agentapi)	1m 46s
Go Quality checks (ubuntu, contractsapi)	53s
Go Quality checks (ubuntu, mocks)	57s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	1m 9s
Go Quality checks (ubuntu, windows-agent)	42s
Go Quality checks (ubuntu, wsl-pro-service)	44s
Flutter integration tests (windows)	11m 58s
Go Quality checks (ubuntu, common)	51s
Go Quality checks (windows, agentapi)	5m 48s
C++ Quality Checks	2m 32s
Go Quality checks (windows, contractsapi)	3m 44s
Go Quality checks (windows, mocks)	3m 33s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	5m 42s
Flutter Quality checks (ubuntu, p4w_ms_store)	2m 8s
Go Quality checks (windows, windows-agent)	6m 36s
Go Quality checks (windows, end-to-end)	6m 27s
Flutter Quality checks (ubuntu, ubuntupro)	4m 16s
Go Quality checks (windows, common)	5m 59s
Flutter Quality checks (windows, p4w_ms_store)	4m 7s
Flutter Quality checks (windows, ubuntupro)	6m 46s
Run Go tests with mocks (ubuntu, windows-agent)	5m 46s
Run Go tests with mocks (ubuntu, wsl-pro-service)	3m 1s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	3m 46s
Run Go tests with mocks (windows, windows-agent)	5m 7s
Run Go tests with mocks (windows, common)	2m 49s
	1h 37m 7s

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