Change the implementation to use checkboxes in the UI

[ShrutiC-git]

This PR has the following changes:

• UI Changes:

  • User can enter the type of sink (HTTP/other).
  • Multi-select of events at once through checkboxes.

• Events Supported

  • Job updated, created.
  • Build started, completed, finalized, failed
  • Job entered queue, job left queue

• Abstract implementation of the type of sink.

  • HTTP Sink implementation provided.

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• [X] Ensure you have provided tests - that demonstrates feature works or fixes the issue