fix(providers): resolve UI attachment limit with the same model->provider helper as execution

The file-upload control imported getProviderFromModel from @/providers/models, but
the execution path and every other consumer use the one in @/providers/utils (runtime
registry + reseller patterns). Align the UI so its size cap can't disagree with
server-side validation for reseller or dynamically-listed models.

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/file-upload/file-upload.tsx

@@ -25,7 +25,7 @@ import {
   workspaceFilesKeys,
 } from '@/hooks/queries/workspace-files'
 import { getProviderAttachmentMaxBytes } from '@/providers/attachments'
-import { getProviderFromModel } from '@/providers/models'
+import { getProviderFromModel } from '@/providers/utils'
 import { useWorkflowRegistry } from '@/stores/workflows/registry/store'
 import { useWorkflowStore } from '@/stores/workflows/workflow/store'