feat(FR-2622): add bulk vfolder trash support on model card bulk deletion

[agatha197]

Resolves #6841 (FR-2622)

Summary

Extends the FR-2622 single-card delete-with-folder UX to the bulk-delete flow on the Admin Model Card list page.

• Add an opt-in "Also delete the associated model folders" checkbox to the bulk delete confirmation modal (matches the single-card modal copy/tooltip)
• Wire a new Relay mutation bulkDeleteVfoldersV2 and call it after adminDeleteModelCardsV2 succeeds — passing the vfolderIds of the selected cards (skips cards with no vfolder)
• After folders are moved to trash, replace the plain success message with a BAINotification whose action link navigates to Data > Trash (/admin-data?statusCategory=deleted). No name/id filter is applied in the bulk case — the trash tab is shown unfiltered, per design discussion
• If the checkbox is left unchecked the existing BulkDeleteCompleted toast is preserved (no behavior change)
• Add i18n keys to all 21 locales:
  • adminModelCard.AlsoDeleteModelFolders
  • adminModelCard.BulkDeleteModelCardsAndFoldersCompleted

Test plan

• Bulk-delete N model cards without checkbox → toast {{count}} model card(s) have been deleted.
• Bulk-delete N model cards with checkbox → notification with Go to Data > Trash link, navigates to /admin-data?statusCategory=deleted
• Mix of cards with and without vfolders → only the cards that have vfolders are sent to bulkDeleteVfoldersV2
• bash scripts/verify.sh — Relay / Lint / Format / TS all green

Checklist:

• Documentation
• Minimum required manager version
• Specific setting for review (eg., KB link, endpoint or how to setup)
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

[agatha197]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• test(FR-2652): fix parallel interference and folder-dialog flakiness in delete spec #7162
• test(FR-2622): add E2E tests for bulk vfolder trash on model card bulk deletion #7137
• feat(FR-2622): add bulk vfolder trash support on model card bulk deletion #7135 👈 (View in Graphite)
• test(FR-2652): add E2E tests for admin model card deletion with folder option #6887 : 1 other dependent PR (#6969 )
• fix(FR-2651): list all model-store folders when creating a model card #6888
• chore(FR-2622): add i18n translations for delete-folder option #6883
• fix(FR-2622): add delete-folder option and trash notification on model card deletion #6881
• main

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Coverage report for ./react

St.❔	Category	Percentage	Covered / Total
🔴	Statements	8.09% (-0.01% 🔻)	1858/22962
🔴	Branches	7.34% (-0.01% 🔻)	1187/16182
🔴	Functions	4.8% (-0% 🔻)	296/6169
🔴	Lines	7.86% (-0.01% 🔻)	1749/22247

Test suite run success

865 tests passing in 40 suites.

Report generated by 🧪jest coverage report action from e32933e