fix: enable contextIsolation by default in Electron

[flotwig]

• Closes

User facing changelog

Additional details

• This became the default with Electron 12, we should follow the defaults as closely as possible.
• Users can override using before:browser:launch API
• internal change: contextBridge.exposeInMainWorld must now be used to expose preload APIs, but this only affects the ipc object used by desktop-gui, so it should not affect users: https://www.electronjs.org/docs/tutorial/context-isolation

How has the user experience changed?

PR Tasks

• [na] 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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[cypress]

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Test summary

553 • 0 • 0 • 0

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Run details

Project	cypress
Status	Passed
Commit	c4ffb3a
Started	Mar 15, 2021 11:19 PM
Ended	Mar 15, 2021 11:28 PM
Duration	08:34 💡
OS	Linux Debian - 10.8
Browser	Electron 89

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[cypress-bot]

Released in 7.0.0.

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