Relative paths are relative to current project locally and in Cloud

[radeusgd]

Pull Request Description

• Close Enso should support relative path for files #10622
• Changes project-manager and ensoup launcher to run the engine/language-server with working directory set to the directory containing currently running project.
• If the working directory is not "the directory containing currently running project", a warning is written to logs. This can happen if the raw /bin/enso engine runner is used in a different directory.
• In the Cloud, the File.new interprets relative paths as cloud paths relative to the Cloud directory containing the current project. Absolute paths are unaffected.

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.