Add --disable-private-check runner option

[Akirathan]

Pull Request Description

I forgot to add the --disable-private-check cmdline option in #8202. This PR fixes this:

> enso -h | grep -A2 private
    --disable-private-check                Disables private module
                                           checking at runtime. Useful for
                                           tests.

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,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.