DPC-4286 credential management error handling

[jdettmannnava]

🎫 Ticket

https://jira.cms.gov/browse/DPC-4286

🛠 Changes

• API handles bad characters in signature snippet
• TextArea component shows errors
• New public key, client token, and ip address forms show errors on fields
• Public key, client token, and ip address controllers delegate all field checking to managers, send errors to components
• Public key, client token, and ip address managers check all input, return errors
• CredentialManager concern added to dedupe code

ℹ️ Context

Original error handling was very primitive, pending decisions by content. Now we have the content.

🧪 Validation

Automated and manual testing

Client Tokens

Blank fields

Label too long

Server error

IP Addresses

Blank fields

Invalid input

Already at maximum number of ip addresses

Server error

Public Keys

Blank fields

Bad inputs

Signature doesn't match

Private key

Server error