bevy_input: Apply #![deny(clippy::allow_attributes, clippy::allow_attributes_without_reason)] (#17242)

# Objective
- https://github.com/bevyengine/bevy/issues/17111

## Solution
Set the `clippy::allow_attributes` and
`clippy::allow_attributes_without_reason` lints to `deny`, and bring
`bevy_input` in line with the new restrictions.

## Testing
`cargo clippy --tests --package bevy_input` was run, and no errors were
encountered.

crates/bevy_input/src/keyboard.rs

@@ -238,7 +238,10 @@ pub enum NativeKeyCode {
     all(feature = "serialize", feature = "bevy_reflect"),
     reflect(Serialize, Deserialize)
 )]
-#[allow(clippy::doc_markdown)] // Clippy doesn't like our use of <kbd>.
+#[expect(
+    clippy::doc_markdown,
+    reason = "We use camel-case words inside `<kbd>` tags to represent keyboard keys, which are not identifiers that we should be putting inside backticks."
+)]
 #[repr(u32)]
 pub enum KeyCode {
     /// This variant is used when the key cannot be translated to any other variant.
@@ -764,7 +767,10 @@ pub enum NativeKey {
     all(feature = "serialize", feature = "bevy_reflect"),
     reflect(Serialize, Deserialize)
 )]
-#[allow(clippy::doc_markdown)] // Clippy doesn't like our use of <kbd>.
+#[expect(
+    clippy::doc_markdown,
+    reason = "We use camel-case words inside `<kbd>` tags to represent keyboard keys, which are not identifiers that we should be putting inside backticks."
+)]
 pub enum Key {
     /// A key string that corresponds to the character typed by the user, taking into account the
     /// user’s current locale setting, and any system-level keyboard mapping overrides that are in

crates/bevy_input/src/lib.rs

@@ -1,5 +1,10 @@
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![forbid(unsafe_code)]
+#![deny(
+    clippy::allow_attributes,
+    clippy::allow_attributes_without_reason,
+    reason = "See #17111; To be removed once all crates are in-line with these attributes"
+)]
 #![doc(
     html_logo_url = "https://bevyengine.org/assets/icon.png",
     html_favicon_url = "https://bevyengine.org/assets/icon.png"