Fixes downloading of files. It used to fail because it returned almost immediately. Also fixes progress reporting when fetching a String.
# Important Notes
Tested by removing appropriate engine and runtime from `$HOME/.local/share/enso` and with manually running:
```
java -jar launcher.jar --launcher-log-level trace install engine 2024.1.1-nightly.2024.2.29
```
In PR #8953, in commit ba0a69de6e, I have introduced argument files to the `native-image`. In this PR, let's try to upload these argfiles as artifacts on GH, so that we can inspect them later.
There are two projects transitively required by `runtime`, that have akka dependencies:
- `downloader`
- `connected-lock-manager`
This PR replaces the `akka-http` dependency in `downloader` by HttpClient from JDK, and splits `connected-lock-manager` into two projects such that there are no akka classes in `runtime.jar`.
# Important Notes
- Simplify the `downloader` project - remove akka.
- Add HTTP tests to the `downloader` project that uses our `http-test-helper` that is normally used for stdlib tests.
- It required few tweaks so that we can embed that server in a unit test.
- Split `connected-lock-manager` project into two projects - remove akka from `runtime`.
- **Native image build fixes and quality of life improvements:**
- Output of `native-image` is captured 743e167aa4
- The output will no longer be intertwined with the output from other commands on the CI.
- Arguments to the `native-image` are passed via an argument file, not via command line - ba0a69de6e
- This resolves an issue on Windows with "Command line too long", for example in https://github.com/enso-org/enso/actions/runs/7934447148/job/21665456738?pr=8953#step:8:2269
In order to investigate `engine/language-server` project, I need to be able to open its sources in IGV and NetBeans.
# Important Notes
By adding same Java source (this time `package-info.java`) and compiling with our Frgaal compiler the necessary `.enso-sources*` files are generated for `engine/language-server` and then the `enso4igv` plugin can open them and properly understand their compile settings.
In addition to that this PR enhances the _"logical view"_ presentation of the project by including all source roots found under `src/*/*`.
