Implement Issue snapshot testing (#2497)
* Fix bug with build globs
I passed the wrong root path, meaning the globs would ascend until the root of your filesystem. Any modification in any ancestor would rebuild turbopack-tests.
(This was also the behavior before I split the tests crate out of turbopack, meaning we spent a lot of time rebuilding if anything in your paths changed…)
* Implement basic debugging on Files
* Implement hash on PlainIssue
* Implement Issue snapshots
* Update snapshots
* Fix per-user content
* Track everything in static output directory
* Fix merge conflicts
* Commit stubbed node_modules to snapshots
* Lint fixes
