[MI] kill captured_mi_execute_command_actions

[Vladimir Prus]

The captured_mi_execute_command presently is passed a pointer to
struct captured_mi_execute_command_args, and the 'action' field
thereof is later consulted by mi_execute_command to decide if we
should print the prompt. The problem is that the 'action' field is
never assigned the value that would cause the prompt to be suppressed,
and in fact not always assigned any deterministic value. This patch
garbage-collects all this.

Checked in.

- Volodya
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