fix(jest-mock): add construct signature to MockedClass

[eyupcanakman]

Summary

Fixes #14458.

const M = Foo as Mocked<typeof Foo>; const x = new M(); typed x as Foo, not a mocked instance, so x.method.mock was not visible. MockedClass<T> had a call signature but no new signature, so new fell through to the original constructor via MockedObject<T>.

The fix adds a construct signature returning Mocked<InstanceType<T>>, matching the existing call signature.

Classes with overloaded constructors still resolve to the original type, since MockedObject<T> includes the raw class and its construct signatures take precedence. Single-constructor classes, including the reported case, are fixed.

Test plan

yarn test-types for jest-mock. The existing class type test in Mocked.test.ts drops a now-unnecessary cast and asserts the constructed instance is Mocked<InstanceType<typeof MockSomeClass>>; it fails without the signature and passes with it.

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• ✅ login: eyupcanakman / name: eyupcanakman (4b82f14, b4096e3)

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commit: 4b82f14