Add RAI prefix for OSS UI telemetry events

[tongyu-microsoft]

This PR adds RAI_ prefix for OSS UI telemetry events.

Description

Event names are started with RAI_ to make filter easier in AML studio.

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #1584 (f8696c0) into main (4df0cb2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1584   +/-   ##
=======================================
  Coverage   88.04%   88.04%           
=======================================
  Files         109      109           
  Lines        5295     5295           
=======================================
  Hits         4662     4662           
  Misses        633      633           

Flag	Coverage Δ
unittests	88.04% <ø> (ø)

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/tongy/addTelemetryPrefix/dashboard/index.html