fix: prevent stubbed cy.intercepts from reaching server

[flotwig]

• Closes [7.0.0] cy.intercept(): stubbed responses still send request to server #15841

User facing changelog

Fixed an issue introduced in 7.0.0 where requests with responses stubbed via cy.intercept(routeMatcher, staticResponse) would still be sent to the destination server.

Additional details

Introduced in #15255

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?

[cypress-bot]

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[cypress]

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Test summary

4021 • 0 • 49 • 2 • 0

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Run details

Project	cypress
Status	Passed
Commit	ec239db
Started	Apr 12, 2021 5:09 PM
Ended	Apr 12, 2021 5:19 PM
Duration	10:49 💡
OS	Linux Debian - 10.8
Browser	Chrome 89

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