Remove Qwen2 model (#18444)

Removed deprecated Qwen2 7B Instruct model from zed.dev provider (staff
only).

Release Notes:

- N/A

crates/language_model/src/model/cloud_model.rs

@@ -12,7 +12,6 @@ pub enum CloudModel {
     Anthropic(anthropic::Model),
     OpenAi(open_ai::Model),
     Google(google_ai::Model),
-    Zed(ZedModel),
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, JsonSchema, EnumIter)]
@@ -21,26 +20,6 @@ pub enum ZedModel {
     Qwen2_7bInstruct,
 }
 
-impl ZedModel {
-    pub fn id(&self) -> &str {
-        match self {
-            ZedModel::Qwen2_7bInstruct => "Qwen/Qwen2-7B-Instruct",
-        }
-    }
-
-    pub fn display_name(&self) -> &str {
-        match self {
-            ZedModel::Qwen2_7bInstruct => "Qwen2 7B Instruct",
-        }
-    }
-
-    pub fn max_token_count(&self) -> usize {
-        match self {
-            ZedModel::Qwen2_7bInstruct => 28000,
-        }
-    }
-}
-
 impl Default for CloudModel {
     fn default() -> Self {
         Self::Anthropic(anthropic::Model::default())
@@ -53,7 +32,6 @@ impl CloudModel {
             Self::Anthropic(model) => model.id(),
             Self::OpenAi(model) => model.id(),
             Self::Google(model) => model.id(),
-            Self::Zed(model) => model.id(),
         }
     }
 
@@ -62,7 +40,6 @@ impl CloudModel {
             Self::Anthropic(model) => model.display_name(),
             Self::OpenAi(model) => model.display_name(),
             Self::Google(model) => model.display_name(),
-            Self::Zed(model) => model.display_name(),
         }
     }
 
@@ -78,7 +55,6 @@ impl CloudModel {
             Self::Anthropic(model) => model.max_token_count(),
             Self::OpenAi(model) => model.max_token_count(),
             Self::Google(model) => model.max_token_count(),
-            Self::Zed(model) => model.max_token_count(),
         }
     }
 
@@ -115,9 +91,6 @@ impl CloudModel {
                     LanguageModelAvailability::RequiresPlan(Plan::ZedPro)
                 }
             },
-            Self::Zed(model) => match model {
-                ZedModel::Qwen2_7bInstruct => LanguageModelAvailability::RequiresPlan(Plan::ZedPro),
-            },
         }
     }
 }