fix(jest-mock): type constructed mocked class instances

[KirtiRamchandani]

Summary

Fixes #14458.

MockedClass<T> already typed mock calls with constructor parameters, but it did not expose a construct signature returning a mocked instance. As a result, constructing a class returned by ModuleMocker.generateFromMetadata() was typed as the original instance type, so mocked methods like instance.memberB.mock were missing at the type level even though they exist at runtime.

This adds the missing construct signature and covers the regression in the jest-mock TSTyche tests.

Test plan

• corepack yarn tsc -b packages\expect-utils packages\jest-types packages\jest-util packages\jest-mock
• corepack yarn tstyche packages\jest-mock\__typetests__\ModuleMocker.test.ts packages\jest-mock\__typetests__\Mocked.test.ts
• corepack yarn tstyche packages/jest-mock/__typetests__
• corepack yarn eslint packages\jest-mock\src\index.ts packages\jest-mock\__typetests__\ModuleMocker.test.ts
• corepack yarn jest packages\jest-mock\src\__tests__\index.test.ts --runInBand
• git diff --check

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commit: b8f301e

[KirtiRamchandani]

The remaining CI failure looks unrelated to this PR's type-only change. The failed macOS with shard 3/3 / Node v24.x job retries yarn test-ci-partial:parallel --max-workers 3 --shard=3/3; each attempt ends with a worker SIGSEGV in unrelated suites (packages/jest-util/src/__tests__/globsToMatcher.test.ts, packages/jest-circus/src/__tests__/utils.test.ts, e2e/__tests__/environmentTeardownError.test.ts, e2e/__tests__/testRetries.test.ts). All other checks, including Require Changelog and Codecov, are green.

I don't see a code change needed in this branch from that log; this looks like a macOS/Node runner crash and should be safe to rerun.