fix(types): fix typedefs for retries config

[kuceb]

previously typedefs required you to specify both openMode and runMode, but it's easier to just exclude one or the other e.g:
retries: { runMode: 2 }

• Closes TBD

User facing changelog

update type definitions for retries config

Additional details

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue been tagged with a release in ZenHub?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?
• Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

3843 • 0 • 55 • 1

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Run details

Project	cypress
Status	Passed
Commit	bba822c
Started	Oct 19, 2020 5:51 AM
Ended	Oct 19, 2020 6:04 AM
Duration	13:18 💡
OS	Linux Debian - 10.2
Browser	Firefox 77

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[jennifer-shehane]

Cool, didn't know this. I verified this actually does work as documented in types.

[cypress-bot]

Released in 5.5.0.

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