1. Bumped eslint and its plugins versions, and autofix new errors (mostly eslint disables which were no longer neccessary)
2. ~~Replace eslint with eslint-p which speed up linter a bit (at least on my machine)~~ - CI machines don't like it.
3. Fixed/worked around one problem with flacky selection _unit_ tests.
* Disable signing artifacts for PRs and develop
Added `*-sign-artifacts` to disable/enable signing. By default it is
true, except for PRs and develop.
* nit
* typo
* lint
* linting
* Fixes [#10983](https://github.com/enso-org/enso/issues/10983) The `ext` field was not set according to the documentation in rust
* Also discovered a regression in opening project by passing argument/clicking the file: we store the file location as `file://` URL, but without caution, it made a havoc with windows paths.
# Important Notes
- [x] **Need to confirm that everything works on macOS** (installation with file associations + opening project when process is running and when not)
- Remove unnecessary modules
- Remove `ts-plugin-namespace-auto-import` as it was a workaround to use the non-conventional `import *` convention
- Remove `esbuild-plugin-copy-directories` as it is unuse
- Inline modules that are only ever used once
- Inline `project-manager-shim` into `gui2` - it is only used during `gui2`'s dev mode
- Inline `content-config` into `client`
- Flatten `app/ide-desktop/lib/` to `app/ide-desktop/`
- Flatten `app/ide-desktop/lib/dashboard/` to `app/dashboard/`
# Important Notes
- As mentioned above, all remaining modules have been moved up from `app/ide-desktop/lib/` to `app/ide-desktop/`. It's not ideal but I'd rather hold off on moving them anywhere else before we have a consensus on what should go where.
- (That is to say, this may not be the final directory structure - but I figure it's fine to get *something* done so that hopefully the rest of the restructuring is simpler.)
