[enhancement] add plan level options to disable some specific terraform commands

[arongate]

Description

add some options to disable some terraform command at the plan level. Can be usefull when module still under development but does not want it to

Suggestion

...
plans:
  - name: terraform/demo
    disable_terraform_init: true
    disable_terraform_validate: true
    disable_terraform_plan: true
    disable_terraform_apply: true
    disable_terraform_install: true
    disable_terraform_destroy: true
...