Remove ResetSessionRecordingConfig with incorrect return type (#38736)

The cluster config RPC service had a typo in the return type of
ResetSessionRecordingConfig. Since our proto linter doesn't allow
renaming, this removes the RPC entirely so that it can be added
with the correct signature in a follow up. This service was only
recently introduced, and is not exposed in any way with the Auth
grpc server so removal is a safe operation.

api/proto/teleport/clusterconfig/v1/clusterconfig_service.proto

@@ -37,8 +37,6 @@ service ClusterConfigService {
   rpc UpdateSessionRecordingConfig(UpdateSessionRecordingConfigRequest) returns (types.SessionRecordingConfigV2);
   // UpsertSessionRecordingConfig overwrites the active session recording configuration.
   rpc UpsertSessionRecordingConfig(UpsertSessionRecordingConfigRequest) returns (types.SessionRecordingConfigV2);
-  // ResetSessionRecordingConfig restores the active session recording configuration to default settings.
-  rpc ResetSessionRecordingConfig(ResetSessionRecordingConfigRequest) returns (types.ClusterNetworkingConfigV2);
 
   // GetAuthPreference retrieves the active auth preference.
   rpc GetAuthPreference(GetAuthPreferenceRequest) returns (types.AuthPreferenceV2);