Force TFSTATE check by clicking button

[volter1337]

Changes required:

• Add boolean validating, and show some loading signs? The PATCH /tfstate/{id}/forcecheck?
  That returns some error? like a long-running endpoint? Another one non-blocking, a flag forceCheck to check in the next iteration. That can be read by the frontend to show a spinner, or something like that.
  Also, some error reporting if the check fails, Report the aws error as "error" or whathever.
  Necessary.

How to handle validation errors:

1. The program exited with non-0 error code? There was some error during execution.

• New flag to tfstate: forcedValidation. Must execute this until the validation ends.
• if some error occurs during the validation, save in the output as "Error:" and parse it accordingly.
• Return the error output in the API properly
• Handle error cases in the frontend as well.

[lleps]

done