add Cypress.sinon type

[bahmutov]

• Closes Add Sinon to Cypress TypeScript interface #6720

User facing changelog

Added TypeScript for property Cypress.sinon

Additional details

This property exists on the object, but we did not have the type for it

How has the user experience changed?

Errors are gone, see the issue for screenshots

PR Tasks

• Have tests been added/updated?
• Has the original issue been tagged with a release in ZenHub?
• Have API changes been updated in the type definitions?

Related docs PR: cypress-io/cypress-documentation#2608

[cypress-bot]

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PR Review Checklist

If any of the following requirements can't be met, leave a comment in the review selecting 'Request changes', otherwise 'Approve'.

User Experience

• The feature/bugfix is self-documenting from within the product.
• The change provides the end user with a way to fix their problem (no dead ends).

Functionality

• The code works and performs its intended function with the correct logic.
• Performance has been factored in (for example, the code cleans up after itself to not cause memory leaks).
• The code guards against edge cases and invalid input and has tests to cover it.

Maintainability

• The code is readable (too many nested 'if's are a bad sign).
• Names used for variables, methods, etc, clearly describe their function.
• The code is easy to understood and there are relevant comments explaining.
• New algorithms are documented in the code with link(s) to external docs (flowcharts, w3c, chrome, firefox).
• There are comments containing link(s) to the addressed issue (in tests and code).

Quality

• The change does not reimplement code.
• There's not a module from the ecosystem that should be used instead.
• There is no redundant or duplicate code.
• There are no irrelevant comments left in the code.
• Tests are testing the code’s intended functionality in the best way possible.

Internal

• The original issue has been tagged with a release in ZenHub.

[cypress]

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Test summary

6966 • 0 • 97 • 0

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Run details

Project	cypress
Status	Passed
Commit	25b2742
Started	Mar 13, 2020 7:40 PM
Ended	Mar 13, 2020 7:46 PM
Duration	05:56 💡
OS	Linux Debian - 10.1
Browser	Multiple

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