fix: hanging due to deep clone on mocha runnable object in server/reporter

[kuceb]

• Closes Test retries, when retrying on several failed tests, causes hanging in cypress run #9040

User facing changelog

Bug Fix: fix issue causing runs with retries enabled to hang

Additional details

we were deep cloning a mocha runnable object, which recursed through runnable.parent and growed exponentially with every test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue or this PR been tagged with a release in ZenHub?

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[cypress]

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Test summary

9179 • 0 • 118 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	434e7a8
Started	Jan 4, 2021 2:46 PM
Ended	Jan 4, 2021 2:57 PM
Duration	11:43 💡
OS	Linux Debian - 10.5
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/retries.ui.spec.js		1
1	runner/cypress retries.ui.spec > opens attempt on each attempt failure for the screenshot, and closes after test passes

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[jennifer-shehane]

Very snappy! No longer hangs on multiple retries.