[Wf-Diagnostics] Point to activity task for activity failures

[sankari165]

What changed?
Failure metadata has details on activity task scheduled and started event attributes

Why?
To provide more info on the activity that failed

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.79%. Comparing base (77c61f2) to head (de98273).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ce/worker/diagnostics/invariant/failure/failure.go	88.23%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...ce/worker/diagnostics/invariant/failure/failure.go	95.31% <88.23%> (-2.61%)	⬇️

... and 7 files with indirect coverage changes

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