[FEATURE]: add support for removing executors from configuration file

[shahzebsiddiqui]

Please describe your feature

add support in buildtest to remove executors via command line.

We can introduce a command name buildtest config executors remove which takes positional argument to remove executors by name.

Let's say we have the following executors as shown below

(buildtest)  ~/Documents/github/buildtest/ [devel*] buildtest cg executors   
generic.local.sh
generic.local.csh
generic.local.zsh

If we want to remove the zsh executor we could do buildtest config executors remove generic.local.zsh and this will remove the section for zsh which would be the section for zsh under the executors section

(buildtest)  ~/Documents/github/buildtest/ [devel*] buildtest cg executors -y
executors:
  local:
    bash:
      description: submit jobs on local machine using bash shell
      shell: 123bash
    csh:
      description: submit jobs on local machine using csh shell
      shell: csh
    sh:
      description: submit jobs on local machine using sh shell
      shell: sh
    zsh:
      description: submit jobs on local machine using zsh shell
      shell: zsh

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