fix(mock): prepend strict mock type declarations in tags-split MSW/faker output

[Hypenate]

Problem

Orval 8.16.0 generates mock factory signatures that reference strict mock helper types (MockWithNullableOverrides, {Schema}Mock, etc.) but does not emit the corresponding export type declarations when all of the following are combined:

• output.mode: 'tags-split'
• override.mock.required: true and override.mock.nonNullable: true (strict mock mode, feat(mock): emit strict Mock return types when required and nonNullable are both true #3529)
• mock.generators: [{ type: 'msw' }, { type: 'faker', arrayItems: true }]
• mock.indexMockFiles: true

This produces TypeScript errors such as:

error TS2304: Cannot find name 'MockWithNullableOverrides'.
error TS2304: Cannot find name 'PetMock'.
error TS2552: Cannot find name 'getPetMock'. Did you mean 'getGetPetsResponseMock'?

Why existing tests do not catch it

Strict-mock fixtures (issue-3525, issue-3525-multi, etc.) use client: 'fetch' and a single-file / non-tags-split layout. They do not cover tags-split per-tag .msw.ts + .faker.ts with arrayItems: true.

In that layout, strictMockSchemaTypeNames was dropped when building tag targets, so finalizeMockImplementation / dedupeStrictMockTypeDeclarations never prepended strict types. Faker files also referenced schema factories emitted only in the MSW file because array-item factory dedup was scoped per tag but not per mock generator file.

Expected behavior

Each generated mock file that references strict mock types should include (once per file):

• export type KeysWithNull<O> = { ... };
• export type MockWithNullableOverrides<...> = ...;
• export type PetMock = { [K in keyof Required<Pet>]: NonNullable<Required<Pet>[K]>; };

Faker files must define or import schema factories they call (e.g. getPetMock()).

Related PRs

• feat(mock): emit strict Mock return types when required and nonNullable are both true #3529 — strict mock return types when required + nonNullable are both true
• refactor(mock): emit strict mock types once from structured names #3543 — emit strict types once via strictMockSchemaTypeNames / finalizeMockImplementation