Misc v3 linear tasks (#767)

* v3_reroute 404 error

* hash change

* fixed issue with error conversion

* added new model confirmation tests
+ title name change

* renaming, fields

* owner; test changes

* clippy prepare

* fmt

* merge fixes

* clippy

* working merge

* revs

* merge fixes

tests/common/api_common/request_data.rs

@@ -0,0 +1,24 @@
+// The structures for project/version creation.
+// These are created differently, but are essentially the same between versions.
+
+use labrinth::util::actix::MultipartSegment;
+
+use crate::common::dummy_data::TestFile;
+
+pub struct ProjectCreationRequestData {
+    pub slug: String,
+    pub jar: Option<TestFile>,
+    pub segment_data: Vec<MultipartSegment>,
+}
+
+pub struct VersionCreationRequestData {
+    pub version: String,
+    pub jar: Option<TestFile>,
+    pub segment_data: Vec<MultipartSegment>,
+}
+
+pub struct ImageData {
+    pub filename: String,
+    pub extension: String,
+    pub icon: Vec<u8>,
+}