Add sharding key triggers to uploads partitions

What does this MR do and why?

• Add sharding key triggers to uploads partitions according to this proposal.
• Add missing uploads_sharding_key

Addresses #398199

Dependency	Partition	Trigger	Sharding Key
abuse_reports	abuse_report_uploads	trigger_3434b82e5e12	organization_id
achievements	achievement_uploads	trigger_cca6a43d90dd	namespace_id
ai_vectorizable_files	ai_vectorizable_file_uploads	trigger_fcc3ea1f9d4e	project_id
alert_management_alert_metric_images	alert_management_alert_metric_image_uploads	trigger_47c43d40f0d2	project_id
appearances (gitlab_main_cell_setting)	appearance_uploads (gitlab_main_cell_setting)	❌	❌ schema: gitlab_main_cell_setting -> Cell-local, unsharded table
bulk_import_export_uploads	bulk_import_export_upload_uploads	trigger_c40a5bb7c1c3 trigger_d32ff9d5c63d	project_id namespace_id
dependency_list_export_parts (gitlab_sec)	dependency_list_export_part_uploads (gitlab_main_org)	❌	organization_id
dependency_list_exports (gitlab_sec)	dependency_list_export_uploads (gitlab_main_org)	❌	project_id namespace_id organization_id
design_management_designs_versions	design_management_action_uploads	trigger_c24a252f7b04	namespace_id
import_export_uploads	import_export_upload_uploads	trigger_1a41d368edd5 trigger_1a052e65e9d9	project_id namespace_id
issuable_metric_images	issuable_metric_image_uploads	trigger_e740510cfd33	namespace_id
namespaces	namespace_uploads	trigger_442d030cfdfe	namespace_id
organization_details	organization_detail_uploads	trigger_1825cdc71779	organization_id
project_relation_export_uploads	project_import_export_relation_export_upload_uploads	trigger_f468204dcd5d	project_id
topics	project_topic_uploads	trigger_4f1b6c76fdfc	organization_id
projects	project_uploads	trigger_38b6d9d97935	project_id
snippets	snippet_uploads	trigger_a68471fea292	organization_id
user_permission_export_uploads	user_permission_export_upload_uploads	trigger_67d0d39e2f41	uploaded_by_user_id (users)
users	user_uploads	trigger_25ba78722e56	organization_id
vulnerability_archive_exports (gitlab_sec)	vulnerability_archive_export_uploads (gitlab_main_org)	❌	project_id
vulnerability_export_parts (gitlab_sec)	vulnerability_export_part_uploads (gitlab_main_org)	❌	organization_id
vulnerability_exports (gitlab_sec)	vulnerability_export_uploads (gitlab_main_org)	❌	organization_id
vulnerability_remediations (gitlab_sec)	vulnerability_remediation_uploads (gitlab_main_org)	❌	project_id

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