fix(relay/client): fail all log watchers in case of single stream failure #51
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Switched to ErrorWaitGroups from simple waitgroups, so we can control behaviour of goroutine groups. Error Groups with Contexts, cancel context as soon as one of the sub goroutines return a non nil error. Added context handling inside Watch Functions so that context cancellation from error wait groups is handled.
This fixes the issue where one of the streams would error out, but the reconnection didn't happen because other streams are working as expected.