Fixes#10668Fixes#8484
Summary of changes:
* `gui2` and `dashboard` are merged to `gui` directory. Various configs were merged (package.json, playwrigth, TS...). The src and e2e directories are split to `dashboard` and `project-view` for now.
* E2E tests run two servers on different ports. The tests are organized in projects. This is also to be changed soon, as we plan to [use better mocking in GUI/ProjectView](#9726)
* ESlint configs were merged to central `eslint.config.mjs`, and that file was moved to repository root. We kept the dashboard lints, but they can be relaxed. The dashboard code was changed to meet GUI lints.
* Also, the versions of linter plugins were bumped, and code fixed.
* The ide-desktop/client no longer has `dashboard` dependency - the only type used there was moved to common package.
* `common` package moved to `app`.
Fixes#10197
# Important Notes
From now on, package installation will be using `pnpm install`. Installing it globally is fine for convenience, but it can also be used as `corepack pnpm install` without having to install anything other than node. For now, all other scripts are still invoked using `npm`, so we can still invoke them with usual `--workspace` setting. As far as I can tell that doesn't really have any other side effects and is identical as running the script through `pnpm run` in respective workspace project subdirectory.
This PR removes enso-pack (ensogl-pack) crate.
It still keeps the `enso-runner` JS package, as it is used for CLI argument parser and logger. The runner should be probably refactored (and possible removed altogether).
# Important Notes
I've temporarily extracted the `enso-runner` to `lib/js` directory, as I wanted to avoid keeping pure JS library under `lib/rust`. Attempts at integrating this with `app/ide-desktop` and family caused too much trouble for this PR. The expectation is that the package will be removed or moved elsewhere soon anyway.
