Must specify --repl to enable debug server

[JaroslavTulach]

Pull Request Description

By default there is no debug server when --run a file or project. As a result using Standard.Base.Runtime.Debug.breakpoint is no-op. Use one of --repl or --inspect (but not both) to let a REPL or debugger stop on the breakpoint statement.

Checklist

When using enso --run ... --inspect and connecting Chrome Dev Tools hitting Debug.breakpoint automatically stops in the debugger.

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
  Java,
• Unit tests have been written where possible.

[JaroslavTulach]

Follow up of #10670 to not start debug server by default. One has to add --repl to start the debug server.