feat: [breaking] remove experimentalComponentTesting and require component tests to be run inside of open-ct

[JessicaSachs]

This PR requires users migrate from the Cypress E2E Runner to the Cypress Component Test Runner. The addition of the open-ct and run-ct subcommands eliminates the need for a dedicated experimental feature flag (experimentalComponentTesting).

User facing changelog

• With the addition of a dedicated component testing entrypoint, the experimentalComponentTesting flag has been removed.
• Projects setting this flag in cypress.json will throw an error, and component tests may only be run within cypress open-ct.
• Please refer to the Migration Guide for complete migration instructions.

Additional details

The file:preprocessor hook used by the E2E runner to compile specs is incompatible with the new dev-server:start hook used to compile specs. This change was necessary to cut users over to the new dev server architecture.

How has the user experience changed?

• The Desktop GUI no longer lists component tests
• Component tests must be run from within the open-ct command.

Before: Cypress CT and E2E tests are listed alongside each other

After:
Desktop GUI does not display component tests

Component Test runner displays component tests

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]

Thanks for taking the time to open a PR!

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.
• Become familiar with the Code Review Checklist for guidelines on coding standards and what needs to be done before a PR can be merged.

[cypress]

---

Test summary

3983 • 0 • 52 • 1 • 0

---

Run details

Project	cypress
Status	Passed
Commit	1ed434c
Started	Mar 30, 2021 11:12 PM
Ended	Mar 30, 2021 11:23 PM
Duration	10:51 💡
OS	Linux Debian - 10.5
Browser	Firefox 77

View run in Cypress Dashboard ➡️

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[lmiller1990]

@JessicaSachs this is all good now. To confirm you intention was making run-ct and open-ct public?

Also ci/circleci: desktop-gui-component-tests is now gone? Seems CI did not realize.

[agg23]

Yes @lmiller1990, the exposure of open-ct is intentional

[cypress-bot]

Released in 7.0.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v7.0.0, please open a new issue.