Mitigate race in wslinstance's TestConnected #1637

Job	Run time
gRPC files are up to date (agentapi)	1m 18s
C++ Quality Checks	1m 15s
gRPC files are up to date (wslserviceapi)	46s
Flutter integration tests (windows)	1m 22s
Run Go tests with mocks (ubuntu, windows-agent)	10s
Flutter Quality checks (ubuntu, gui/packages/p4w_ms_store)	1m 27s
Run Go tests with mocks (ubuntu, wsl-pro-service)	18s
Go Quality checks (ubuntu, agentapi)	59s
Flutter Quality checks (ubuntu, gui/packages/ubuntupro)	1m 27s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	43s
Go Quality checks (ubuntu, contractsapi)	23s
Flutter Quality checks (windows, gui/packages/p4w_ms_store)	1m 24s
Run Go tests with mocks (windows, windows-agent)	35s
Go Quality checks (ubuntu, mocks)	58s
Flutter Quality checks (windows, gui/packages/ubuntupro)	1m 20s
Run Go tests with mocks (windows, common)	37s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	44s
Go Quality checks (ubuntu, windows-agent)	44s
Go Quality checks (ubuntu, wsl-pro-service)	41s
Go Quality checks (ubuntu, common)	50s
Build Windows Agent Appx	1m 10s
Go Quality checks (windows, agentapi)	24s
Build wsl-pro-service debian package	1m 5s
Go Quality checks (windows, contractsapi)	23s
Go Quality checks (windows, mocks)	20s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	14s
Go Quality checks (windows, windows-agent)	18s
Go Quality checks (windows, end-to-end)	21s
Go Quality checks (windows, common)	23s
	22m 39s

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