big commit with letters removal

tests/app/test_navigation.py

@@ -61,7 +61,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'create_and_send_messages',
     'create_api_key',
     'create_email_branding',
-    'create_letter_branding',
     'data_retention',
     'delete_contact_list',
     'delete_service_template',
@@ -81,7 +80,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'edit_organisation_domains',
     'edit_organisation_email_branding',
     'edit_organisation_go_live_notes',
-    'edit_organisation_letter_branding',
     'edit_organisation_name',
     'edit_organisation_notes',
     'edit_organisation_type',
@@ -90,7 +88,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'edit_service_notes',
     'edit_service_template',
     'edit_sms_provider_ratio',
-    'edit_template_postage',
     'edit_user_email',
     'edit_user_mobile_number',
     'edit_user_permissions',
@@ -107,7 +104,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'estimate_usage',
     'features',
     'features_email',
-    'features_letters',
     'features_sms',
     'feedback',
     'find_services_by_name',
@@ -136,11 +132,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'integration_testing',
     'invite_org_user',
     'invite_user',
-    'letter_branding',
-    'letter_branding_request',
-    'letter_spec',
-    'letter_specification',
-    'letter_template',
     'link_service_to_organisation',
     'live_services',
     'live_services_csv',
@@ -152,9 +143,7 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'new_password',
     'no_cookie.check_messages_preview',
     'no_cookie.check_notification_preview',
-    'no_cookie.letter_branding_preview_image',
     'no_cookie.send_test_preview',
-    'no_cookie.view_letter_template_preview',
     'no_cookie.view_template_version_preview',
     'notifications_sent_by_service',
     'old_guest_list',
@@ -167,7 +156,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'organisation_dashboard',
     'organisation_download_agreement',
     'organisation_preview_email_branding',
-    'organisation_preview_letter_branding',
     'organisation_settings',
     'organisation_trial_mode_services',
     'organisations',
@@ -175,7 +163,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'platform_admin',
     'platform_admin_list_complaints',
     'platform_admin_reports',
-    'platform_admin_returned_letters',
     'platform_admin_splash_page',
     'pricing',
     'privacy',
@@ -193,9 +180,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'resend_email_link',
     'resend_email_verification',
     'resume_service',
-    'returned_letter_summary',
-    'returned_letters',
-    'returned_letters_report',
     'revalidate_email_sent',
     'revoke_api_key',
     'roadmap',
@@ -208,43 +192,31 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'send_messages',
     'send_notification',
     'send_one_off',
-    'send_one_off_letter_address',
     'send_one_off_step',
     'send_one_off_to_myself',
-    'send_uploaded_letter',
     'service_accept_agreement',
     'service_add_email_reply_to',
-    'service_add_letter_contact',
     'service_add_sms_sender',
     'service_agreement',
     'service_confirm_agreement',
     'service_confirm_delete_email_reply_to',
-    'service_confirm_delete_letter_contact',
     'service_confirm_delete_sms_sender',
     'service_dashboard',
     'service_dashboard_updates',
     'service_delete_email_reply_to',
-    'service_delete_letter_contact',
     'service_delete_sms_sender',
     'service_download_agreement',
     'service_edit_email_reply_to',
-    'service_edit_letter_contact',
     'service_edit_sms_sender',
     'service_email_reply_to',
-    'service_letter_contact_details',
-    'service_make_blank_default_letter_contact',
     'service_name_change',
     'service_preview_email_branding',
-    'service_preview_letter_branding',
     'service_set_auth_type',
     'service_set_channel',
     'service_set_email_branding',
     'service_set_inbound_number',
     'service_set_inbound_sms',
-    'service_set_international_letters',
     'service_set_international_sms',
-    'service_set_letter_branding',
-    'service_set_letters',
     'service_set_permission',
     'service_set_reply_to_email',
     'service_set_sms_prefix',
@@ -283,11 +255,7 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'two_factor_email_sent',
     'two_factor_webauthn',
     'update_email_branding',
-    'update_letter_branding',
-    'upload_a_letter',
     'upload_contact_list',
-    'upload_letter',
-    'uploaded_letter_preview',
     'uploads',
     'usage',
     'user_information',
@@ -314,7 +282,6 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'view_job_csv',
     'view_job_updates',
     'view_jobs',
-    'view_letter_upload_as_preview',
     'view_notification',
     'view_notification_updates',
     'view_notifications',