fix: Allow 'this' to be used in overridden commands

[BlueWinds]

• Closes Commands using this context can't be overwritten #18892

User facing changelog

Cypress commands that rely on this can now be overridden cleanly,

Additional details

Previously, there was no clean way to invoke an overridden command that, for example, read the test title:

Cypress.Commands.add('foo', function () {
  cy.log(this.test.title) // this works if not overwritten
})

Cypress.Commands.overwrite('foo', function (originalFn) {
  return originalFn.call(this) // throws error, because the originalFn is not *actually* the original function, but a wrapper around it.
})

I don't believe this requires any change in the documentation - it's a fairly niche limitation for command authors. This just makes our API work as you would expect if familiar with JS, instead of having an unexpected limitation. There was no particularly good reason for this limitation, and removing it is easy.

PR Tasks

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

[cypress-bot]

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[cypress]

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Test summary

18704 • 1 • 202 • 0 • 2

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Run details

Project	cypress
Status	Failed
Commit	42e55ec
Started	Nov 22, 2021 8:16 PM
Ended	Nov 22, 2021 8:27 PM
Duration	11:49 💡
OS	Linux Debian - 10.10
Browser	Multiple

View run in Cypress Dashboard ➡️

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Failures

	cypress/integration/cypress/proxy-logging-spec.ts		1
1	Proxy Logging > request logging > xhr log has response body/status code

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Flakiness

	commands/net_stubbing_spec.ts		1
1	network stubbing > waiting and aliasing > can timeout waiting on a single request using "alias.request"
	cypress/proxy-logging-spec.ts		1
1	Proxy Logging > request logging > xhr log has response body/status code

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[cypress-bot]

Released in 9.1.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v9.1.0, please open a new issue.