Since we are launching a completely different process for the extension
tests than the process that is launched by VSCode, we need to add some
special handling for the debugging.
This will let the extension host/VSCode expose a debugging port, which
VSCode will then connect to. This is "less desirable than letting the
bootloader do its thing", but a packaged VSCode application does not
allow using the bootloader (`NODE_OPTIONS`=`--require=...`). Therefore,
we have to fallback to this option.
See: 47c60558ec/src/configuration.ts (L405-L411)
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