ref: Fix new Clippy lints (#935)

Resolves #934
Resolves [RUST-124](https://linear.app/getsentry/issue/RUST-124/fix-lint-ci-job-failures)

Author: szokeasaurusrex

sentry-types/src/protocol/attachment.rs

@@ -3,10 +3,11 @@ use std::fmt;
 use serde::Deserialize;
 
 /// The different types an attachment can have.
-#[derive(Debug, Clone, Eq, PartialEq, Deserialize)]
+#[derive(Debug, Clone, Eq, PartialEq, Deserialize, Default)]
 pub enum AttachmentType {
     #[serde(rename = "event.attachment")]
     /// (default) A standard attachment without special meaning.
+    #[default]
     Attachment,
     /// A minidump file that creates an error event and is symbolicated. The
     /// file should start with the `MDMP` magic bytes.
@@ -28,12 +29,6 @@ pub enum AttachmentType {
     Custom(String),
 }
 
-impl Default for AttachmentType {
-    fn default() -> Self {
-        Self::Attachment
-    }
-}
-
 impl AttachmentType {
     /// Gets the string value Sentry expects for the attachment type.
     pub fn as_str(&self) -> &str {

sentry-types/src/protocol/session.rs

@@ -13,10 +13,12 @@ use crate::utils::{ts_rfc3339, ts_rfc3339_opt};
 /// The Status of a Release Health Session.
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, Deserialize, Serialize)]
 #[serde(rename_all = "snake_case")]
+#[derive(Default)]
 pub enum SessionStatus {
     /// The session is healthy.
     ///
     /// This does not necessarily indicate that the session is still active.
+    #[default]
     Ok,
     /// The session terminated normally.
     Exited,
@@ -26,12 +28,6 @@ pub enum SessionStatus {
     Abnormal,
 }
 
-impl Default for SessionStatus {
-    fn default() -> Self {
-        Self::Ok
-    }
-}
-
 /// An error used when parsing `SessionStatus`.
 #[derive(Debug, Error)]
 #[error("invalid session status")]