feature_flags: Add FeatureFlag suffix to feature flag types (#29392)

This PR adds the `FeatureFlag` suffix to the feature flag types that
were missing them.

This makes the names easier to search in the codebase.

Release Notes:

- N/A

crates/feature_flags/src/feature_flags.rs

@@ -64,18 +64,18 @@ impl FeatureFlag for PredictEditsRateCompletionsFeatureFlag {
     const NAME: &'static str = "predict-edits-rate-completions";
 }
 
-pub struct LanguageModels {}
-impl FeatureFlag for LanguageModels {
+pub struct LanguageModelsFeatureFlag {}
+impl FeatureFlag for LanguageModelsFeatureFlag {
     const NAME: &'static str = "language-models";
 }
 
-pub struct LlmClosedBeta {}
-impl FeatureFlag for LlmClosedBeta {
+pub struct LlmClosedBetaFeatureFlag {}
+impl FeatureFlag for LlmClosedBetaFeatureFlag {
     const NAME: &'static str = "llm-closed-beta";
 }
 
-pub struct ZedPro {}
-impl FeatureFlag for ZedPro {
+pub struct ZedProFeatureFlag {}
+impl FeatureFlag for ZedProFeatureFlag {
     const NAME: &'static str = "zed-pro";
 }
 
@@ -85,13 +85,13 @@ impl FeatureFlag for NotebookFeatureFlag {
     const NAME: &'static str = "notebooks";
 }
 
-pub struct Debugger {}
-impl FeatureFlag for Debugger {
+pub struct DebuggerFeatureFlag {}
+impl FeatureFlag for DebuggerFeatureFlag {
     const NAME: &'static str = "debugger";
 }
 
-pub struct ThreadAutoCapture {}
-impl FeatureFlag for ThreadAutoCapture {
+pub struct ThreadAutoCaptureFeatureFlag {}
+impl FeatureFlag for ThreadAutoCaptureFeatureFlag {
     const NAME: &'static str = "thread-auto-capture";
 
     fn enabled_for_staff() -> bool {