[Wf-Diagnostics] update diagnostics workflow to return the result of diagnostics

[sankari165]

What changed?
The workflow returns the issues identified, potential rootcause and a link to runbook

Why?
Diagnostics workflow performs the diagnostics on a w/f and should return the result collectively

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[3vilhamster]

LGTM.
Suggestion is to pull the development to the internal monorepo and merge back to OS once everything is tested on internal scenarios.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.01%. Comparing base (ac349fc) to head (c54420e).
Report is 2 commits behind head on master.

Files	Patch %	Lines
service/worker/diagnostics/workflow.go	77.77%	2 Missing ⚠️

Additional details and impacted files

Files	Coverage Δ
service/worker/diagnostics/activities.go	100.00% <ø> (ø)
service/worker/diagnostics/workflow.go	88.57% <77.77%> (+1.47%)	⬆️

... and 5 files with indirect coverage changes

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