Remove RPC messages pertaining to the LLM token (#36252)

This PR removes the RPC messages pertaining to the LLM token.

We now retrieve the LLM token from Cloud.

Release Notes:

- N/A

crates/proto/proto/ai.proto

@@ -158,14 +158,6 @@ message SynchronizeContextsResponse {
     repeated ContextVersion contexts = 1;
 }
 
-message GetLlmToken {}
-
-message GetLlmTokenResponse {
-    string token = 1;
-}
-
-message RefreshLlmToken {}
-
 enum LanguageModelRole {
     LanguageModelUser = 0;
     LanguageModelAssistant = 1;

crates/proto/proto/zed.proto

@@ -250,10 +250,6 @@ message Envelope {
         AddWorktree add_worktree = 222;
         AddWorktreeResponse add_worktree_response = 223;
 
-        GetLlmToken get_llm_token = 235;
-        GetLlmTokenResponse get_llm_token_response = 236;
-        RefreshLlmToken refresh_llm_token = 259;
-
         LspExtSwitchSourceHeader lsp_ext_switch_source_header = 241;
         LspExtSwitchSourceHeaderResponse lsp_ext_switch_source_header_response = 242;
 
@@ -419,7 +415,9 @@ message Envelope {
     reserved 221;
     reserved 224 to 229;
     reserved 230 to 231;
+    reserved 235 to 236;
     reserved 246;
+    reserved 259;
     reserved 270;
     reserved 247 to 254;
     reserved 255 to 256;

crates/proto/src/proto.rs

@@ -119,8 +119,6 @@ messages!(
     (GetTypeDefinitionResponse, Background),
     (GetImplementation, Background),
     (GetImplementationResponse, Background),
-    (GetLlmToken, Background),
-    (GetLlmTokenResponse, Background),
     (OpenUnstagedDiff, Foreground),
     (OpenUnstagedDiffResponse, Foreground),
     (OpenUncommittedDiff, Foreground),
@@ -196,7 +194,6 @@ messages!(
     (PrepareRenameResponse, Background),
     (ProjectEntryResponse, Foreground),
     (RefreshInlayHints, Foreground),
-    (RefreshLlmToken, Background),
     (RegisterBufferWithLanguageServers, Background),
     (RejoinChannelBuffers, Foreground),
     (RejoinChannelBuffersResponse, Foreground),
@@ -354,7 +351,6 @@ request_messages!(
     (GetDocumentHighlights, GetDocumentHighlightsResponse),
     (GetDocumentSymbols, GetDocumentSymbolsResponse),
     (GetHover, GetHoverResponse),
-    (GetLlmToken, GetLlmTokenResponse),
     (GetNotifications, GetNotificationsResponse),
     (GetPrivateUserInfo, GetPrivateUserInfoResponse),
     (GetProjectSymbols, GetProjectSymbolsResponse),