breaking: remove typescript 4 from component testing

[AtofStryker]

• Closes BREAKING CHANGE: Remove support for TypeScript 4 #31187

Additional details

removes typescript 4 support from CT scaffolding. For e2e testing, tsx should work with TypeScript 4 but we will not be supporting it generally moving forward

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

[cypress]

cypress    Run #61580

Run Properties:   Passed #61580  •  ec0e38d5fc: breaking: remove support for typescript 4

Project	cypress
Branch Review	breaking/remove_typescript_4
Run status	Passed #61580
Run duration	11m 44s
Commit	ec0e38d5fc: breaking: remove support for typescript 4
Committer	AtofStryker
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	694
Skipped	0
Passing	802
View all changes introduced in this branch ↗︎

UI Coverage  33.47%
Untested elements	125
Tested elements	76

Accessibility  92.18%
Failed rules	3 critical   7 serious   1 moderate   1 minor
Failed elements	525

[jennifer-shehane]

Looks good. Confirmed that it basically still works with TS 4 if you skip the install step, it's just not in the setup screen as supported.

[AtofStryker]

Looks good. Confirmed that it basically still works with TS 4 if you skip the install step, it's just not in the setup screen as supported.

@jennifer-shehane correct. As far as E2E is concerned, we don't check the TypeScript version but tsx should be able to run it since we are really just using whatever version of TypeScript the user has installed. That being said we likely don't want official support for the older versions but I don't think we have that defined anywhere?