Use a unique feature name for Workhorse send blob migration

lib/gitlab/workhorse.rb

@@ -62,7 +62,7 @@ module Gitlab
       end
 
       def send_git_blob(repository, blob)
-        params = if Gitlab::GitalyClient.feature_enabled?(:project_raw_show)
+        params = if Gitlab::GitalyClient.feature_enabled?(:workhorse_raw_show)
                    {
                      'GitalyServer' => gitaly_server_hash(repository),
                      'GetBlobRequest' => {

spec/lib/gitlab/workhorse_spec.rb

@@ -325,7 +325,7 @@ describe Gitlab::Workhorse, lib: true do
 
     subject { described_class.send_git_blob(repository, blob) }
 
-    context 'when Gitaly project_raw_show feature is enabled' do
+    context 'when Gitaly workhorse_raw_show feature is enabled' do
       it 'sets the header correctly' do
         key, command, params = decode_workhorse_header(subject)
 
@@ -345,7 +345,7 @@ describe Gitlab::Workhorse, lib: true do
       end
     end
 
-    context 'when Gitaly project_raw_show feature is disabled', skip_gitaly_mock: true do
+    context 'when Gitaly workhorse_raw_show feature is disabled', skip_gitaly_mock: true do
       it 'sets the header correctly' do
         key, command, params = decode_workhorse_header(subject)