Scripts: migrate unpack-next to TypeScript (#77538)
## Convert unpack-next.cjs to TypeScript
### What?
Converted `scripts/unpack-next.cjs` to TypeScript, renaming it to
`scripts/unpack-next.ts` and updating the imports and type definitions.
### Why?
This change continues the ongoing TypeScript migration efforts in the
codebase, providing better type safety and developer experience.
### How?
- Renamed file from `.cjs` to `.ts`
- Converted CommonJS `require()` statements to ES module `import`
statements
- Added type annotation for the `path` parameter in the `realPathIfAny`
function
Fixes #
