refactor(error): remove dead error variants from client 0.34 migration

Remove Error::Client and ConfigError::EncryptConfig variants that
wrapped cipherstash_client::config::errors::ConfigError. No code path
produces this error type after the client 0.34 refactor.

Author: tobyhede

packages/cipherstash-proxy/src/error.rs

@@ -15,9 +15,6 @@ pub enum Error {
     #[error("Connection closed after cancel request")]
     CancelRequest,
 
-    #[error(transparent)]
-    Client(#[from] cipherstash_client::config::errors::ConfigError),
-
     #[error(transparent)]
     Config(#[from] ConfigError),
 
@@ -119,9 +116,6 @@ pub enum ConfigError {
     #[error(transparent)]
     Certificate(#[from] rustls_pki_types::pem::Error),
 
-    #[error(transparent)]
-    EncryptConfig(#[from] cipherstash_client::config::errors::ConfigError),
-
     #[error(transparent)]
     Database(#[from] tokio_postgres::Error),