Update filing validator error handling

[guffee23]

In the filing_validators.py, implement a different way to handle error messages when the validator throws an error. Currently, validations are duplicated for the sake of more accurate error responses. Change this to reduce the redundancy of the validations while still providing accurate messaging.

Current possible implementation is by putting the error messages piped into the validation name check.
Example - "valid_filing_exists|sign".

The error message will be an enum or a value that actually points to the message. The message will then be grabbed and formatted with the appropriate data to return the message. If no second value is piped in, use the generic message supplied in the validator already.

In the request_action_validator.py, the validator_name needs to be parsed to ensure it'll still choose the correct validations even with the newly piped value added in.