Convert if-chain bash error message converter into a map[err_code, str]

This refactoring is needed to reduce lines of code necessary to report error in a human readable form in the bash runner. If possible, produce a useful documentation on how introduce new error messages in the already created runners and how to create new runners with a map error code to message function.

Current state

The current error resolution is:

if bash_run.returncode is NOT_EXECUTABLE_ERROR and not bash_run.stdout:
  bash_run.stdout = f'{program_file_name} is not executable'

if bash_run.returncode is MISSING_FILE_ERROR and not bash_run.stdout:
  bash_run.stdout = f'{program_file_name} is missing'

Next state

Has to become:

error_map: dict[int, str] = {
    (NOT_EXECUTABLE_ERROR, '...'),
    (MISSING_FILE_ERROR, '...'),
    ...
}
message = error_map[err_code]

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