Add retries for TCS publish requests#4975
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Summary
Fixes #4105.
Adds retry handling around individual TCS publish requests for telemetry metrics and task health messages. If a transient websocket publish failure occurs, the agent now retries the generated request before giving up and returning the last error to the existing caller/logging path.
Testing
gofmt -w ecs-agent/tcs/client/client.go ecs-agent/tcs/client/client_test.gogo test -tags unit ./tcs/clientfrom theecs-agentmoduleNote: I saw another contributor had commented interest on the issue, but I did not find an open PR referencing #4105 before opening this one.