fix: ensure delete option in files is available to authorized users only

[SinghaAnirban005]

Brief Title

Restrict Delete Icon Visibility to Authorized Users in File List

Acceptance Criteria fulfillment

• [x] Ensure the delete icon is only visible to users with delete permissions.
• [x] Verify that users without delete permissions do not see the delete icon in the file list.

Fixes #803

Video/Screenshots

https://github.com/user-attachments/assets/969de8e0-0009-41ca-b994-f7d8e7715f86

PR Test Details

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-839 after approval. Contributors are requested to replace <pr_number> with the actual PR number.