fix(cli): use per-pid filename for downloaded cypress zip

[flotwig]

• Closes When downloading 2 versions of Cypress simultaneously, one clobbers the other resulting in nondescript error and exit #4595

User facing changelog

• Fixed an issue that could cause failure when installing two Cypresses at the same time.

Additional details

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?

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[cypress]

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Test summary

3977 • 0 • 49 • 2

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Run details

Project	cypress
Status	Passed
Commit	6b0051d
Started	Feb 5, 2021 9:54 PM
Ended	Feb 5, 2021 10:06 PM
Duration	11:27 💡
OS	Linux Debian - 10.5
Browser	Chrome 83

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[jennifer-shehane]

I'm not sure how to manually test this, but this was the proposed change. I have a reproducible example I can check after it's released. #4595 (comment)