fix(npm/react): remove unnecessary dependency

[lmiller1990]

• Closes Peer dependency issue - @cypress/webpack-preprocessor doesn't support webpack@^5 #16401

User facing changelog

Remove unnecessary @cypress/webpack-preprocessor dependency from @cypress/react.

Additional details

@cypress/react should not be coupled to or require any webpack specific dependencies.

How has the user experience changed?

Fixes problem where npm 7 raises an error related to dependencies on installation.

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?

[cypress-bot]

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[lmiller1990]

Not used

[cypress]

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Test summary

13841 • 0 • 164 • 5 • 0

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Run details

Project	cypress
Status	Passed
Commit	211e7cd
Started	May 11, 2021 1:44 AM
Ended	May 11, 2021 1:56 AM
Duration	11:43 💡
OS	Linux Debian - 10.8
Browser	Multiple

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