chore[devtools]: upgrade to webpack v5 (#26887)

## Summary
- Updated `webpack` (and all related packages) to v5 in
`react-devtools-*` packages.
- I haven't touched any `TODO (Webpack 5)`. Tried to poke it, but each
my attempt failed and parsing hook names feature stopped working. I will
work on this in a separate PR.
- This work is one of prerequisites for updating Firefox extension to
manifests v3

related PRs:
https://github.com/facebook/react/pull/22267
https://github.com/facebook/react/pull/26506

## How did you test this change?
Tested on all surfaces, explicitly checked that parsing hook names
feature still works.