Use Circle CI for Windows builds, remove AppVeyor

[flotwig]

• Closes Kitchensink hangs starting a test on CircleCI Windows #5596

User facing changelog

Additional details

• kitchensink fails because of posix-only exec test https://circleci.com/gh/cypress-io/cypress/223570?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• 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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PR Review Checklist

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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

6946 • 0 • 97 • 0

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Run details

Project	cypress
Status	Passed
Commit	48953c9
Started	Feb 26, 2020 10:39 PM
Ended	Feb 26, 2020 10:45 PM
Duration	05:47 💡
OS	Linux Debian - 9.11
Browser	Multiple

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[flotwig]

Can't figure out how to set a default shell for the windows executor, it seems to not work as documented on their site. Waiting for a reply from support before proceeding.

[jennifer-shehane]

Closing this due to inactivity. Please reopen if there is work to be done addressing this again.