We get relative registry path when PLAYWRIGHT_BROWSERS_PATH or HOME is relative.
In this case, it would be good to resolve to the same absolute path
during installation and execution, and we can usually do that using INIT_CWD.
This makes it easier to reason about our packages.
The only difference is what each package downloads.
When the browser is not downloaded, it will fail to launch.
Each browser gets a 'download' attribute in the browser.json file.
