Deleted the AttachmentThumbnailsModal, related components, and composables for managing and displaying attachment thumbnails. Updated AttachmentList and AttachmentDetailModal to remove references to the thumbnails modal and related permissions. Simplified thumbnail display to show only available image thumbnails in the detail modal, and updated i18n files to remove unused thumbnail modal and status translations. Centralized thumbnail width mapping in utils/thumbnail.ts.
Replaced string literals for thumbnail sizes with GetThumbnailByUriSizeEnum throughout the codebase for improved type safety and consistency. Updated generateThumbnailUrl to accept the enum and added a width map for local URLs. Improved attachment thumbnail display and link formatting.
#### What type of PR is this?
/area ui
/kind feature
/milestone 2.21.x
#### What this PR does / why we need it:
Add thumbnail records viewing feature. The main goal is to keep track of failed thumbnail generations, making it easier to check if thumbnails were generated correctly and retry if needed.
<img width="1009" height="859" alt="image" src="https://github.com/user-attachments/assets/d968e416-0b88-45bf-a554-a0c1abcf97a0" />
<img width="1014" height="952" alt="image" src="https://github.com/user-attachments/assets/c5d1a11b-7acc-4ab5-a2da-cf9467cb6b70" />
#### Which issue(s) this PR fixes:
Fixes #
#### Special notes for your reviewer:
#### Does this PR introduce a user-facing change?
```release-note
支持查看附件缩略图记录
```
Ryan Wang