feat: enforce consistent usage of type imports

[marcalexiei]

I noticed that the package was exporting few types as part of a "runtime" export:

test-utils/src/index.ts

Lines 13 to 28 in 94b2eee

	export {
	mount,
	shallowMount,
	renderToString,
	enableAutoUnmount,
	disableAutoUnmount,
	RouterLinkStub,
	VueWrapper,
	DOMWrapper,
	BaseWrapper,
	config,
	flushPromises,
	MountingOptions,
	Stubs,
	createWrapperError
	}

test-utils/src/index.ts

Lines 25 to 26 in 94b2eee

	MountingOptions,
	Stubs,

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test-utils/src/types.ts

Line 89 in 94b2eee

export interface MountingOptions<Props, Data = {}>

test-utils/src/types.ts

Line 111 in 94b2eee

export type Stubs = Record<string, Stub> | Array<string>

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This PR enables and fixes all the issues reported by consistent-type-imports typescript-eslint rule to ensure that import / export types are marked correctly.

I have also updated the eslint.config.mjs to use helpers from eslint/config instead of the deprecated tseslint.config.

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