fix: allow fixtures folder to be the same as integration folder

[bahmutov]

• Closes Cypress doesnt support having the same folder for fixtures and integration #14226

User facing changelog

Cypress no longer fails to find specs if you set the fixtures folder to be the same as the integration folder. Example

{
  "fixturesFolder": "cypress/integration"
}

Additional details

I think this is a valid use case - keeping fixtures right next to the specs, especially if the specs themselves are organized in subfolders as in https://glebbahmutov.com/blog/split-spec/

PR Tasks

• Have tests been added/updated?
• Has the original issue or this PR been tagged with a release in ZenHub?

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[cypress]

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Test summary

9162 • 0 • 118 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	0a09a74
Started	Dec 18, 2020 5:44 PM
Ended	Dec 18, 2020 5:57 PM
Duration	12:55 💡
OS	Linux Debian - 10.5
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/retries.ui.spec.js		1
1	runner/cypress retries.ui.spec > opens attempt on each attempt failure for the screenshot, and closes after test passes

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[jennifer-shehane]

Yah, I agree, this is a valid use case. Looks good.