Remove unused Gitaly feature flags

When GitLab was migrating to Gitaly, feature flags were used. These are
now out of use, and essentially a no-op. But they do make the output of
chatops ugly and the feature table is selected in full by the
application.

db/migrate/20190703130053_remove_gitaly_feature_flags.rb

+# frozen_string_literal: true
+
+class RemoveGitalyFeatureFlags < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  FEATURES = %w[
+    gitaly_batch_lfs_pointers gitaly_blame gitaly_blob_get_all_lfs_pointers gitaly_blob_get_new_lfs_pointers
+    gitaly_branch_names gitaly_branch_names_contains_sha gitaly_branches gitaly_bundle_to_disk
+    gitaly_calculate_checksum gitaly_can_be_merged gitaly_cherry_pick gitaly_commit_count
+    gitaly_commit_deltas gitaly_commit_languages gitaly_commit_messages gitaly_commit_patch
+    gitaly_commit_raw_diffs gitaly_commit_stats gitaly_commit_tree_entry gitaly_commits_between
+    gitaly_commits_by_message gitaly_conflicts_list_conflict_files gitaly_conflicts_resolve_conflicts gitaly_count_commits
+    gitaly_count_diverging_commits_no_max gitaly_create_branch gitaly_create_repo_from_bundle gitaly_create_repository
+    gitaly_delete_branch gitaly_delete_refs gitaly_delta_islands gitaly_deny_disk_acces
+    gitaly_diff_between gitaly_extract_commit_signature gitaly_fetch_ref gitaly_fetch_remote
+    gitaly_fetch_source_branch gitaly_filter_shas_with_signature gitaly_filter_shas_with_signatures gitaly_find_all_commits
+    gitaly_find_branch gitaly_find_commit gitaly_find_commits gitaly_find_ref_name
+    gitaly_force_push gitaly_fork_repository gitaly_garbage_collect gitaly_get_info_attributes
+    gitaly_git_blob_load_all_data gitaly_git_blob_raw gitaly_git_fsck gitaly_go-find-all-tags
+    gitaly_has_local_branches gitaly_import_repository gitaly_is_ancestor gitaly_last_commit_for_path
+    gitaly_license_short_name gitaly_list_blobs_by_sha_path gitaly_list_commits_by_oid gitaly_local_branches
+    gitaly_ls_files gitaly_merge_base gitaly_merged_branch_names gitaly_new_commits
+    gitaly_operation_user_add_tag gitaly_operation_user_commit_file gitaly_operation_user_commit_files gitaly_operation_user_create_branch
+    gitaly_operation_user_delete_branch gitaly_operation_user_delete_tag gitaly_operation_user_ff_branch gitaly_operation_user_merge_branch
+    gitaly_post_receive_pack gitaly_post_upload_pack gitaly_project_raw_show gitaly_raw_changes_between
+    gitaly_rebase gitaly_rebase_in_progress gitaly_ref_delete_refs gitaly_ref_exists
+    gitaly_ref_exists_branch gitaly_ref_exists_branches gitaly_ref_find_all_remote_branches gitaly_remote_add_remote
+    gitaly_remote_fetch_internal_remote gitaly_remote_remove_remote gitaly_remote_update_remote_mirror gitaly_remove_namespace
+    gitaly_repack_full gitaly_repack_incremental gitaly_repository_cleanup gitaly_repository_exists
+    gitaly_repository_size gitaly_root_ref gitaly_search_files_by_content gitaly_search_files_by_name
+    gitaly_squash gitaly_squash_in_progress gitaly_ssh_receive_pack gitaly_ssh_upload_pack
+    gitaly_submodule_url_for gitaly_tag_messages gitaly_tag_names gitaly_tag_names_contains_sha
+    gitaly_tags gitaly_tree_entries gitaly_wiki_delete_page gitaly_wiki_find_file
+    gitaly_wiki_find_page gitaly_wiki_get_all_pages gitaly_wiki_page_formatted_data gitaly_wiki_page_versions
+    gitaly_wiki_update_page gitaly_wiki_write_page gitaly_workhorse_archive gitaly_workhorse_raw_show
+    gitaly_workhorse_send_git_diff gitaly_workhorse_send_git_patch gitaly_write_config gitaly_write_ref
+  ]
+
+  class Feature < ActiveRecord::Base
+    self.table_name = 'features'
+  end
+
+  def up
+    Feature.where(key: FEATURES).delete_all
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190628185004) do
+ActiveRecord::Schema.define(version: 20190703130053) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"