fix(reporters): --merge-reports to show each total run times

[AriPerkkio]

Description

• Fixes Total test duration is wrong in --merge-reports #7825

Adds total test run times of each blob in test report of --merge-reports run. The Duration is sum of all blobs. Below it we show Per blob durations.

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[sheremet-va]

Generally, I dislike executionTimes?: number[] as a public API.

What are these numbers? Why are the optional? Do we just keep adding new arguments to hooks? I think this needs to be standardized somehow

Maybe have something like a SubTestRun? Or ShardTestRun

[AriPerkkio]

Do you have any suggestions what would be better way to pass data from blob reporter's readBlob to other reporters? Should we instead store it in ctx or ctx.state?

[sheremet-va]

Do you have any suggestions what would be better way to pass data from blob reporter's readBlob to other reporters? Should we instead store it in ctx or ctx.state?

Storing it in ctx.state seems like an interesting idea actually 🤔 Something like ctx.state.blobs?

[AriPerkkio]

Storing blobs in ctx.state.blobs now. Base reporter is accessing executionTimes from state instead of reporter hooks.