fix: Use app.quit instead of process.exit to prevent crash on close

[chrisbreiding]

• Closes Cypress 8.3.0 is crashing while closing test runner window on MacOS #17766

User facing changelog

• Cypress no longer causes a SIGSEGV error on Mac when closing the test runner

Additional details

Using process.exit() doesn't allow time for other handlers and cleanup to run, causing the SIGSEGV error. app.quit() "guarantees that all beforeunload and unload event handlers are correctly executed."

PR Tasks

• Have tests been added/updated? I updated the unit test, but I don't think there's any way to write an automated test for the actual crashing issue...
• Has the original issue or this PR been tagged with a release in ZenHub?
• N/A Has a PR for user-facing changes been opened in cypress-documentation?
• N/A Have API changes been updated in the type definitions?
• N/A Have new configuration options been added to the cypress.schema.json?

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[cypress]

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Test summary

4183 • 0 • 50 • 2 • 1

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Run details

Project	cypress
Status	Passed
Commit	5a71130
Started	Aug 17, 2021 5:52 PM
Ended	Aug 17, 2021 6:02 PM
Duration	09:53 💡
OS	Linux Debian - 10.9
Browser	Chrome beta 93

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/cypress/proxy-logging-spec.ts		1
1	Proxy Logging > request logging > fetch log shows resource type, url, method, and status code and has expected snapshots and consoleProps

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[flotwig]

Nice 👍

[jennifer-shehane]

I'd like if we had a better way to test for these crashes ahead of release. Manually tested and is no longer crashing when selecting to close Cypress.