proxy: unit tests for auth_quirks (#7199)

## Problem

I noticed code coverage for auth_quirks was pretty bare

## Summary of changes

Adds 3 happy path unit tests for auth_quirks
* scram
* cleartext (websockets)
* cleartext (password hack)

proxy/src/console/provider.rs

@@ -14,7 +14,6 @@ use crate::{
     context::RequestMonitoring,
     scram, EndpointCacheKey, ProjectId,
 };
-use async_trait::async_trait;
 use dashmap::DashMap;
 use std::{sync::Arc, time::Duration};
 use tokio::sync::{OwnedSemaphorePermit, Semaphore};
@@ -326,8 +325,7 @@ pub type CachedAllowedIps = Cached<&'static ProjectInfoCacheImpl, Arc<Vec<IpPatt
 
 /// This will allocate per each call, but the http requests alone
 /// already require a few allocations, so it should be fine.
-#[async_trait]
-pub trait Api {
+pub(crate) trait Api {
     /// Get the client's auth secret for authentication.
     /// Returns option because user not found situation is special.
     /// We still have to mock the scram to avoid leaking information that user doesn't exist.
@@ -363,7 +361,6 @@ pub enum ConsoleBackend {
     Test(Box<dyn crate::auth::backend::TestBackend>),
 }
 
-#[async_trait]
 impl Api for ConsoleBackend {
     async fn get_role_secret(
         &self,

proxy/src/console/provider/mock.rs

@@ -8,7 +8,6 @@ use crate::console::provider::{CachedAllowedIps, CachedRoleSecret};
 use crate::context::RequestMonitoring;
 use crate::{auth::backend::ComputeUserInfo, compute, error::io_error, scram, url::ApiUrl};
 use crate::{auth::IpPattern, cache::Cached};
-use async_trait::async_trait;
 use futures::TryFutureExt;
 use std::{str::FromStr, sync::Arc};
 use thiserror::Error;
@@ -144,7 +143,6 @@ async fn get_execute_postgres_query(
     Ok(Some(entry))
 }
 
-#[async_trait]
 impl super::Api for Api {
     #[tracing::instrument(skip_all)]
     async fn get_role_secret(

proxy/src/console/provider/neon.rs

@@ -14,7 +14,6 @@ use crate::{
     context::RequestMonitoring,
     metrics::{ALLOWED_IPS_BY_CACHE_OUTCOME, ALLOWED_IPS_NUMBER},
 };
-use async_trait::async_trait;
 use futures::TryFutureExt;
 use std::sync::Arc;
 use tokio::time::Instant;
@@ -168,7 +167,6 @@ impl Api {
     }
 }
 
-#[async_trait]
 impl super::Api for Api {
     #[tracing::instrument(skip_all)]
     async fn get_role_secret(