Mitigate race in wslinstance's TestConnected #1638

Job	Run time
Flutter Quality checks (ubuntu, gui/packages/p4w_ms_store)	1m 34s
C++ Quality Checks	2m 33s
gRPC files are up to date (agentapi)	1m 28s
Flutter Quality checks (ubuntu, gui/packages/ubuntupro)	3m 32s
Flutter integration tests (windows)	7m 20s
gRPC files are up to date (wslserviceapi)	1m 0s
Flutter Quality checks (windows, gui/packages/p4w_ms_store)	5m 1s
Flutter Quality checks (windows, gui/packages/ubuntupro)	5m 17s
Go Quality checks (ubuntu, agentapi)	1m 5s
Run Go tests with mocks (ubuntu, windows-agent)	15s
Go Quality checks (ubuntu, contractsapi)	20s
Build Windows Agent Appx	6m 29s
Run Go tests with mocks (ubuntu, wsl-pro-service)	13s
Go Quality checks (ubuntu, mocks)	50s
Build wsl-pro-service debian package	1m 12s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	42s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	31s
Run Go tests with mocks (windows, windows-agent)	39s
Go Quality checks (ubuntu, windows-agent)	1m 7s
Go Quality checks (ubuntu, wsl-pro-service)	56s
Run Go tests with mocks (windows, common)	39s
Go Quality checks (ubuntu, common)	36s
Go Quality checks (windows, agentapi)	2m 36s
Go Quality checks (windows, contractsapi)	1m 9s
Go Quality checks (windows, mocks)	2m 29s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	1m 54s
Go Quality checks (windows, windows-agent)	2m 52s
Go Quality checks (windows, end-to-end)	2m 31s
Go Quality checks (windows, common)	1m 38s
	58m 28s

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