Retry proxied requests when network level errors occur

[brian-mann]

Need to implement the same kind of retry logic as this lib:

https://github.com/FGRibreau/node-request-retry

['ECONNRESET', 'ENOTFOUND', 'ESOCKETTIMEDOUT', 'ETIMEDOUT', 'ECONNREFUSED', 'EHOSTUNREACH', 'EPIPE', 'EAI_AGAIN']

TODO: research EPIPE we may not be able to retry from that.

[brian-mann]

cy.visit, cy.request, and transparently proxied requests should account for this.

IDEA: possibly expose this as global configuration to control the backoff algorithm? Even disable altogether?

retryProxiedRequests: true

[cypress-bot]

The code for this is done in cypress-io/cypress#4015, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 3.3.0.