Enable frozen string in presenters and policies

Enable frozen string in:

* app/presenters
* app/policies

Partially addresses #47424.

app/policies/application_setting/term_policy.rb

+# frozen_string_literal: true
+
 class ApplicationSetting
   class TermPolicy < BasePolicy
     include Gitlab::Utils::StrongMemoize

app/policies/base_policy.rb

+# frozen_string_literal: true
+
 require_dependency 'declarative_policy'
 class BasePolicy < DeclarativePolicy::Base

app/policies/ci/build_policy.rb

+# frozen_string_literal: true
+
 module Ci
   class BuildPolicy < CommitStatusPolicy
     condition(:protected_ref) do

app/policies/ci/pipeline_policy.rb

+# frozen_string_literal: true
+
 module Ci
   class PipelinePolicy < BasePolicy
     delegate { @subject.project }

app/policies/ci/pipeline_schedule_policy.rb

+# frozen_string_literal: true
+
 module Ci
   class PipelineSchedulePolicy < PipelinePolicy
     alias_method :pipeline_schedule, :subject

app/policies/ci/runner_policy.rb

+# frozen_string_literal: true
+
 module Ci
   class RunnerPolicy < BasePolicy
     with_options scope: :subject, score: 0

app/policies/ci/trigger_policy.rb

+# frozen_string_literal: true
+
 module Ci
   class TriggerPolicy < BasePolicy
     delegate { @subject.project }

app/policies/clusters/cluster_policy.rb

+# frozen_string_literal: true
+
 module Clusters
   class ClusterPolicy < BasePolicy
     alias_method :cluster, :subject

app/policies/commit_status_policy.rb

+# frozen_string_literal: true
+
 class CommitStatusPolicy < BasePolicy
   delegate { @subject.project }

app/policies/deploy_key_policy.rb

+# frozen_string_literal: true
+
 class DeployKeyPolicy < BasePolicy
   with_options scope: :subject, score: 0
   condition(:private_deploy_key) { @subject.private? }

app/policies/deploy_token_policy.rb

+# frozen_string_literal: true
+
 class DeployTokenPolicy < BasePolicy
   with_options scope: :subject, score: 0
   condition(:maintainer) { @subject.project.team.maintainer?(@user) }

app/policies/deployment_policy.rb

+# frozen_string_literal: true
+
 class DeploymentPolicy < BasePolicy
   delegate { @subject.project }
 end

app/policies/environment_policy.rb

+# frozen_string_literal: true
+
 class EnvironmentPolicy < BasePolicy
   delegate { @subject.project }

app/policies/external_issue_policy.rb

+# frozen_string_literal: true
+
 class ExternalIssuePolicy < BasePolicy
   delegate { @subject.project }
 end

app/policies/global_policy.rb

+# frozen_string_literal: true
+
 class GlobalPolicy < BasePolicy
   desc "User is blocked"
   with_options scope: :user, score: 0

app/policies/group_label_policy.rb

+# frozen_string_literal: true
+
 class GroupLabelPolicy < BasePolicy
   delegate { @subject.group }
 end

app/policies/group_member_policy.rb

+# frozen_string_literal: true
+
 class GroupMemberPolicy < BasePolicy
   delegate :group

app/policies/group_policy.rb

+# frozen_string_literal: true
+
 class GroupPolicy < BasePolicy
   desc "Group is public"
   with_options scope: :subject, score: 0

app/policies/issuable_policy.rb

+# frozen_string_literal: true
+
 class IssuablePolicy < BasePolicy
   delegate { @subject.project }

app/policies/issue_policy.rb

+# frozen_string_literal: true
+
 class IssuePolicy < IssuablePolicy
   # This class duplicates the same check of Issue#readable_by? for performance reasons
   # Make sure to sync this class checks with issue.rb to avoid security problems.