Add Unit tests and monitoring capability

[sreedhar-guda]

Type of PR

• Documentation changes
• Code changes
• Test changes

Purpose

Implementation samples which include:

• Unit testcases which can be made part of CI process
• Monitoring and telemetry using OpenTelemetry

Author pre-publish checklist

• [x] Added test to prove my fix is effective or new feature works
• [x] No PII in logs
• [x] Made corresponding changes to the documentation

Issues Closed or Referenced

• Closes #issue_number

• References #issue_number

[sreedhar-guda]

Feedback from Elena and Lace as of Aug 27:

• Make the main notebook the good one (move the unit tcs else where). --> TO DO
• It seems a lot, could make it harder for the users to follow.
• Good to separate Fabric specific concepts from others (like unit testing and OTEL) --> TO DO, we already have these files as separate ones. Need to find a good place to move them.

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[sreedhar-guda]

Monitoring write-up is now part of #867