fix: golangci-lint warnings about unsafe integer conversions #3847

Job	Run time
Flutter integration tests (windows)	7m 3s
C++ Quality Checks	1m 54s
Flutter Quality checks (ubuntu, p4w_ms_store)	1m 31s
Flutter Quality checks (ubuntu, ubuntupro)	3m 36s
Go Quality checks (ubuntu, agentapi)	1m 33s
Flutter Quality checks (windows, p4w_ms_store)	2m 48s
Go Quality checks (ubuntu, contractsapi)	53s
Flutter Quality checks (windows, ubuntupro)	4m 32s
Run Go tests with mocks (ubuntu, windows-agent)	7m 56s
Go Quality checks (ubuntu, mocks)	1m 4s
Run Go tests with mocks (ubuntu, wsl-pro-service)	4m 32s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	49s
Run Go tests with mocks (ubuntu, common)	1m 13s
Go Quality checks (ubuntu, windows-agent)	1m 5s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	3m 0s
Go Quality checks (ubuntu, wsl-pro-service)	55s
Run Go tests with mocks (windows, windows-agent)	5m 39s
Go Quality checks (ubuntu, common)	55s
Run Go tests with mocks (windows, common)	1m 30s
Go Quality checks (windows, agentapi)	6m 20s
Go Quality checks (windows, contractsapi)	2m 31s
Go Quality checks (windows, mocks)	3m 37s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	3m 22s
Go Quality checks (windows, windows-agent)	3m 57s
Go Quality checks (windows, end-to-end)	3m 47s
Go Quality checks (windows, common)	3m 46s
	1h 19m 48s

Provide feedback