Add runner token expiration interval settings

What does this MR do and why?

This is the first MR of !71607 (closed), as per !71607 (comment 791611312). It adds database settings for the runner token expiration intervals.

Part of #30942 (closed)

app/graphql/types/ci/pipeline_message_type.rb

+# frozen_string_literal: true
+
+module Types
+  module Ci
+    # rubocop: disable Graphql/AuthorizeTypes
+    class PipelineMessageType < BaseObject
+      graphql_name 'PipelineMessage'
+
+      field :id, GraphQL::Types::ID, null: false,
+            description: 'ID of the pipeline message.'
+
+      field :content, GraphQL::Types::String, null: false,
+            description: 'Content of the pipeline message.'
+    end
+  end
+end