fix: suppress EventEmitter warnings + other Node warnings in prod

[flotwig]

• Closes Do not display MaxListenersExceededWarning "Warning: Possible EventEmitter memory leak detected." warning message during cypress run #1305

User facing changelog

• Fixed an issue where "Possible EventEmitter memory leak detected" warnings could appear when running multiple specs.

Additional details

• increased plugin child ipc listener limit to infinity so the unneeded warning ceases
• fixed an actual event listener leak in electron downloads code
• updated process.emitWarning patching to still log warnings in development, but in production, only log warnings to debug log

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?
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?
• [na] Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[flotwig]

apparently the session is reused between webContents, because this eventually emits the same max listeners warning after 12 or so specfiles have launched Electron

[cypress]

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Test summary

9407 • 0 • 119 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	04960c5
Started	Apr 1, 2021 7:02 PM
Ended	Apr 1, 2021 7:14 PM
Duration	12:11 💡
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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[chrisbreiding]

Very nice! This has been a nuisance for too long now. Good catch on the download behavior leak too.