Move gitaly_blame, gitaly_count_commits, gitaly_commit_count to opt-out

changelogs/unreleased/gitaly-commit-count-opt-out.yml

+---
+title: Move some Gitaly RPC's to opt-out
+merge_request: 19591
+author:
+type: other

lib/gitlab/git/blame.rb

@@ -22,7 +22,7 @@ module Gitlab
       private
 
       def load_blame
-        raw_output = @repo.gitaly_migrate(:blame) do |is_enabled|
+        raw_output = @repo.gitaly_migrate(:blame, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT) do |is_enabled|
           if is_enabled
             load_blame_by_gitaly
           else

lib/gitlab/git/repository.rb

@@ -533,7 +533,7 @@ module Gitlab
       def count_commits(options)
         count_commits_options = process_count_commits_options(options)
 
-        gitaly_migrate(:count_commits) do |is_enabled|
+        gitaly_migrate(:count_commits, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT) do |is_enabled|
           if is_enabled
             count_commits_by_gitaly(count_commits_options)
           else
@@ -738,7 +738,7 @@ module Gitlab
       #
       # Gitaly migration: https://gitlab.com/gitlab-org/gitaly/issues/330
       def commit_count(ref)
-        gitaly_migrate(:commit_count) do |is_enabled|
+        gitaly_migrate(:commit_count, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT) do |is_enabled|
           if is_enabled
             gitaly_commit_client.commit_count(ref)
           else