Improve profiling interface

[kazcw]

Pull Request Description

Fix some small things that were making capturing and using profiles more complicated than necessary. (After this is reviewed I'll PR the new interface in the design doc repo):

Profile a predefined workflow in batch mode:

./run profile --workflow=new_project --save-profile=new_project.json

In this PR:

• --save-profile now works as expected with relative paths. (The application now runs in the directory it is started from, rather than running in its npm root.)
• Most run commands no longer use the shell to invoke their child processes, so we won't have problems with filenames containing special characters.

Profile an interactive session:

./run start --profiling-level=debug -- -- --save-profile=interactive.json

Then save profile and exit with Ctrl+Alt+Q.

In this PR:

• Fixed passing target args (like --save-profile) to run start; this has been broken since Proper implementation of --no-backend flag for ./run script #3426.

View a profile:

./run view-profile new_project.json

In this PR:

• Implemented a command to invoke profiling-run-graph entry point; accepts a path to a profile file.

Misc small improvements

• Fixed rustfmt's configuration so it doesn't produce copious warnings about it, and ./run lint output is readable.
• Removed dead old loading-animation code. It is incompatible with electron>=14, so it hasn't been doing anything for a while.

Checklist

Please include the following checklist in your PR:

• The documentation has been updated if necessary.
• All code conforms to the Scala, Java, and Rust style guides.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed: Enso GUI was tested when built using BOTH ./run dist and ./run watch.

[ci no changelog needed]