chore: switched from Jest to Vitest

[JoshuaKGoldberg]

Purpose of this pull request?

• Documentation update
• Bug fix
• Enhancement
• Other, please explain: Internal tooling upgrade

What changes did you make?

Switches the jest and jest-cli devDependencies to vitest.

Is there anything you'd like reviewers to focus on?

Sending this as a draft as part of investigating as part of #265. I'm trying to figure out how to bump this package to the latest version of yeoman-generator per #258 (comment).

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	mkdirp@​1.0.4
	lodash@​4.17.21
	globals@​11.12.0 ⏵ 16.2.0			+3
	lint-staged@​7.3.0
	prettier@​3.5.3

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert (click for details)
Warn		[email protected] has a Critical CVE. CVE: GHSA-xvch-5gv4-984h Prototype Pollution in minimist (CRITICAL) Affected versions: >= 1.0.0 < 1.2.6; < 0.2.4 Patched version: 0.2.4 From: package-lock.json → npm/[email protected] → npm/[email protected] → npm/[email protected] ℹ Read more on: This package | This alert | What is a critical CVE? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at [email protected]. Suggestion: Remove or replace dependencies that include known critical CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/[email protected]. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Warn		[email protected] has a Critical CVE. CVE: GHSA-4c7m-wxvm-r7gc Improper parsing of octal bytes in netmask (CRITICAL) Affected versions: < 1.1.0 Patched version: 1.1.0 From: package-lock.json → npm/[email protected] ℹ Read more on: This package | This alert | What is a critical CVE? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at [email protected]. Suggestion: Remove or replace dependencies that include known critical CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/[email protected]. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[mshima]

@JoshuaKGoldberg looks ready.