Remove remaining vestiges of jest types

[nolanlawson]

Follow-up to #4396

If you search the codebase for jest, you can still find some Jest-related TypeScript types, e.g.:

lwc/packages/@lwc/module-resolver/scripts/jest/types.ts

Line 11 in c6c6803

namespace jest {

lwc/scripts/jest/utils/matchers.ts

Lines 9 to 10 in c6c6803

	import MatcherUtils = jest.MatcherUtils;
	import CustomMatcherResult = jest.CustomMatcherResult;

These should be migrated to use vitest types instead.

We do also use eslint-plugin-jest, but that's maybe less of a big deal since Jest semantics look very similar to Vitest's. Also apparently eslint-plugin-vitest is not officially-supported by the Vitest project and says "Most of the rules in this plugin are essentially ports of eslint-plugin-jest".