address telemetry loss in very short intervals

[YingXue]

Address two root causes of events/telemetry data loss.

1. Websocket was pushing messages to client too frequently and is causing ui not able to pick up all messages fast enough.
2. EnqueueTimeUtc is not realiable enough to check duplicates as event hub can return messages not always in order.

General Guidelines

• If introducing new functionality or modified behavior, are they backed by unit tests?
• Have all unit tests passed locally? (by running npm run test command)
• Have you updated the README.md with new screenshots if significant changes have been made?
• Have you update the package version if the current version in package.json is not higher than the version released?