Improve `app/policies` coverage (#32426)

spec/policies/account_moderation_note_policy_spec.rb

spec/policies/account_policy_spec.rb

spec/policies/account_warning_policy_spec.rb

spec/policies/account_warning_preset_policy_spec.rb

spec/policies/admin/status_policy_spec.rb

spec/policies/announcement_policy_spec.rb

spec/policies/appeal_policy_spec.rb

spec/policies/audit_log_policy_spec.rb

spec/policies/backup_policy_spec.rb

spec/policies/canonical_email_block_policy_spec.rb

spec/policies/custom_emoji_policy_spec.rb

spec/policies/dashboard_policy_spec.rb

spec/policies/delivery_policy_spec.rb

spec/policies/domain_allow_policy_spec.rb

spec/policies/domain_block_policy_spec.rb

spec/policies/email_domain_block_policy_spec.rb

spec/policies/follow_recommendation_policy_spec.rb

spec/policies/instance_policy_spec.rb

spec/policies/invite_policy_spec.rb

spec/policies/ip_block_policy_spec.rb