fix(next-lint): fix next lint not throwing exit 1 on error (#62378)
## Changes
The error on
https://github.com/vercel/next.js/blob/3e92d8a41d5ed4970e252b6e34f11b100dacd167/packages/next/src/lib/eslint/runLintCheck.ts#L117
runs to the `try` in here →
https://github.com/vercel/next.js/blob/3e92d8a41d5ed4970e252b6e34f11b100dacd167/packages/next/src/cli/next-lint.ts#L191
instead of throwing in the `catch`, so we add a last `else` statement to
`process.exit(1)`.
Closes NEXT-2567