Update @parcel/watcher to 2.5.x

[bpasero]

For very large mono repos with many TS projects, we see endless loops in the file watcher process (e.g. outlook client) that seem to not reproduce when using @parcel/watcher@2.4.x.

However, there are currently 2 blocking issues with that version:

• Allow to consume with C++ sources to build as part of npm install parcel-bundler/watcher#191
• Deadlock between Watcher and Debounce threads parcel-bundler/watcher#187

//cc @deepak1556

[bpasero]

Idea from @deepak1556 as a workaround:

• Have a git repository that has submodule of parcel on that commit
• Have @parcel/watcher point to this new git repo
• In the repo have a package.json two commands in the scripts section
  • install - that would go into the submodule directory and build stuff
  • postinstall - that will copy the contents of the submodule and put them in the root of this git repo so that require works

[bpasero]

A new version got released that allows building from source: https://github.com/parcel-bundler/watcher/releases/tag/v2.5.0

We need to add some filter code to ensure we are not shipping the optional dependency though.