chore(clippy): enable and fix many stricter lints (#3783)

* chore(clippy): enable and fix many stricter lints

These ensure that the codebase uses more idiomatic, performant, and
concise language constructions.

* chore: make non-Clippy compiler warnings also deny by default

apps/labrinth/tests/common/api_v3/mod.rs

@@ -1,5 +1,3 @@
-#![allow(dead_code)]
-
 use super::{
     api_common::{Api, ApiBuildable},
     environment::LocalService,

apps/labrinth/tests/common/api_v3/project.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt::Write};
 
 use actix_http::StatusCode;
 use actix_web::{
@@ -363,13 +363,13 @@ impl ApiProject for ApiV3 {
             featured = featured
         );
         if let Some(title) = title {
-            url.push_str(&format!("&title={title}"));
+            write!(&mut url, "&title={title}").unwrap();
         }
         if let Some(description) = description {
-            url.push_str(&format!("&description={description}"));
+            write!(&mut url, "&description={description}").unwrap();
         }
         if let Some(ordering) = ordering {
-            url.push_str(&format!("&ordering={ordering}"));
+            write!(&mut url, "&ordering={ordering}").unwrap();
         }
 
         let req = test::TestRequest::post()
@@ -394,11 +394,12 @@ impl ApiProject for ApiV3 {
         );
 
         for (key, value) in patch {
-            url.push_str(&format!(
+            write!(
+                &mut url,
                 "&{key}={value}",
-                key = key,
                 value = urlencoding::encode(&value)
-            ));
+            )
+            .unwrap();
         }
 
         let req = test::TestRequest::patch()
@@ -593,17 +594,17 @@ impl ApiV3 {
             let start_date = start_date.to_rfc3339();
             // let start_date = serde_json::to_string(&start_date).unwrap();
             let start_date = urlencoding::encode(&start_date);
-            extra_args.push_str(&format!("&start_date={start_date}"));
+            write!(&mut extra_args, "&start_date={start_date}").unwrap();
         }
         if let Some(end_date) = end_date {
             let end_date = end_date.to_rfc3339();
             // let end_date = serde_json::to_string(&end_date).unwrap();
             let end_date = urlencoding::encode(&end_date);
-            extra_args.push_str(&format!("&end_date={end_date}"));
+            write!(&mut extra_args, "&end_date={end_date}").unwrap();
         }
         if let Some(resolution_minutes) = resolution_minutes {
-            extra_args
-                .push_str(&format!("&resolution_minutes={resolution_minutes}"));
+            write!(&mut extra_args, "&resolution_minutes={resolution_minutes}")
+                .unwrap();
         }
 
         let req = test::TestRequest::get()

apps/labrinth/tests/common/api_v3/request_data.rs

@@ -1,4 +1,3 @@
-#![allow(dead_code)]
 use serde_json::json;
 
 use crate::common::{

apps/labrinth/tests/common/api_v3/version.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt::Write;
 
 use super::{
     ApiV3,
@@ -416,32 +417,36 @@ impl ApiVersion for ApiV3 {
     ) -> ServiceResponse {
         let mut query_string = String::new();
         if let Some(game_versions) = game_versions {
-            query_string.push_str(&format!(
+            write!(
+                &mut query_string,
                 "&game_versions={}",
                 urlencoding::encode(
                     &serde_json::to_string(&game_versions).unwrap()
                 )
-            ));
+            )
+            .unwrap();
         }
         if let Some(loaders) = loaders {
-            query_string.push_str(&format!(
+            write!(
+                &mut query_string,
                 "&loaders={}",
                 urlencoding::encode(&serde_json::to_string(&loaders).unwrap())
-            ));
+            )
+            .unwrap();
         }
         if let Some(featured) = featured {
-            query_string.push_str(&format!("&featured={featured}"));
+            write!(&mut query_string, "&featured={featured}").unwrap();
         }
         if let Some(version_type) = version_type {
-            query_string.push_str(&format!("&version_type={version_type}"));
+            write!(&mut query_string, "&version_type={version_type}").unwrap();
         }
         if let Some(limit) = limit {
             let limit = limit.to_string();
-            query_string.push_str(&format!("&limit={limit}"));
+            write!(&mut query_string, "&limit={limit}").unwrap();
         }
         if let Some(offset) = offset {
             let offset = offset.to_string();
-            query_string.push_str(&format!("&offset={offset}"));
+            write!(&mut query_string, "&offset={offset}").unwrap();
         }
 
         let req = test::TestRequest::get()