Summary

Remove experimental text replacement feature

Details

This removes an experimental feature where putting ''
in the command line would replace that string with the actual PID of the last
started command.

Motivation and Context

This feature has been experimental for a very long time and has never been
developed further. Users who need something like this can create a custom
cucumber step that builds the command string with the actual PID included.

How Has This Been Tested?

The scenario for this feature has been removed. CI should confirm that it is not used anywhere else.

Types of changes

This would be a breaking change if the feature were not experimental. Documentation has been updated as well.

Checklist:

• I've added tests for my code
• My change requires a change to the documentation.
• I have updated the documentation accordingly.