[Wf-Diagnostics] Introduce Diagnostics starter workflow as parent workflow to run diagnostics

[sankari165]

What changed?
diagnostics workflow will run as child workflow within a starter parent workflow that will be triggered by frontend api

Why?
the parent workflow starts and waits for diagnostics to complete and then will execute an activity (will be added in future PR) to emit usage logs into kafka

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.21%. Comparing base (71cf16a) to head (c4d0860).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
service/worker/diagnostics/parent_workflow.go	73.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
service/frontend/api/handler.go	65.97% <100.00%> (ø)
service/worker/diagnostics/module.go	100.00% <100.00%> (ø)
service/worker/diagnostics/workflow.go	82.45% <100.00%> (+0.94%)	⬆️
service/worker/diagnostics/parent_workflow.go	73.33% <73.33%> (ø)

... and 5 files with indirect coverage changes

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[jakobht]

Maybe wrap this error as well?