feat: Set PersonalAccessToken default prefix

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/342327

Changelog: changed

db/migrate/20211028212259_add_default_to_personal_access_tokens_prefix.rb

+# frozen_string_literal: true
+
+class AddDefaultToPersonalAccessTokensPrefix < Gitlab::Database::Migration[1.0]
+  def change
+    change_column_default(:application_settings, :personal_access_token_prefix, from: nil, to: 'glpat-')
+  end
+end

db/schema_migrations/20211028212259

+56af9791c8625d99e9a53690135086afccdbe8f58a5c236d6805b0883fb971b0
\ No newline at end of file

db/structure.sql

@@ -10383,7 +10383,7 @@ CREATE TABLE application_settings (
     encrypted_cloud_license_auth_token_iv text,
     secret_detection_revocation_token_types_url text,
     disable_feed_token boolean DEFAULT false NOT NULL,
-    personal_access_token_prefix text,
+    personal_access_token_prefix text DEFAULT 'glpat-'::text,
     rate_limiting_response_text text,
     invisible_captcha_enabled boolean DEFAULT false NOT NULL,
     container_registry_cleanup_tags_service_max_list_size integer DEFAULT 200 NOT NULL,

doc/api/settings.md

@@ -85,7 +85,7 @@ Example response:
   "raw_blob_request_limit": 300,
   "wiki_page_max_content_bytes": 52428800,
   "require_admin_approval_after_user_signup": false,
-  "personal_access_token_prefix": "GL-",
+  "personal_access_token_prefix": "glpat-",
   "rate_limiting_response_text": null,
   "keep_latest_artifact": true,
   "admin_mode": false,
@@ -187,7 +187,7 @@ Example response:
   "raw_blob_request_limit": 300,
   "wiki_page_max_content_bytes": 52428800,
   "require_admin_approval_after_user_signup": false,
-  "personal_access_token_prefix": "GL-",
+  "personal_access_token_prefix": "glpat-",
   "rate_limiting_response_text": null,
   "keep_latest_artifact": true,
   "admin_mode": false,