fix(cypress/react): handle styled components

[lmiller1990]

• Closes styles are only loaded for first component test if styled-components is used #15879

User facing changelog

Injected styles via styled components get cleaned up after each spec.

Additional details

TODO: explain how to fix or handle styled components

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?
• 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?

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[cypress]

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Test summary

9491 • 0 • 111 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	f6e4708
Started	Apr 15, 2021 2:49 AM
Ended	Apr 15, 2021 3:22 AM
Duration	32:42 💡
OS	Linux Debian - 10.8
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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[lmiller1990]

closed in favor of #16024