Vendor chrometracing, add Close method (#1443)
- Vendor `chrometracing` (mostly, it still references a sub-package that is just a `struct` definition)
- Implement `Close` function for `chrometracing`: it overwrites the trailing `,\n` with `]\n` and closes the file.
- Add an `e2e` test to make sure `JSON.parse` succeeds on the profiling output.
- Exempt `chrometracing` from linting
