[Wf-Diagnostics] Set query handler for diagnostics workflow to provide result

[sankari165]

What changed?
Diagnostics workflow has a query handler that provides the diagnostics result

Why?
Diagnostics workflow start will be triggered via api/cli and result will be fetched via query

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.09%. Comparing base (0a6ad93) to head (5a5277f).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
service/worker/diagnostics/workflow.go	73.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
service/worker/diagnostics/workflow.go	85.00% <73.33%> (-3.58%)	⬇️

... and 7 files with indirect coverage changes

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