feat: Added a conditional check before showing Avatar in attachments

[thepiyush-303]

Brief Title

Acceptance Criteria fulfillment

• Now when avatar is set to false inside addons then attached items's docs not show avatar

Fixes #787

Video/Screenshots

Screencast.from.2025-01-04.01-05-18.webm

PR Test Details

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

[abirc8010]

Hey @thepiyush-303,
I noticed that the video you uploaded might not correspond to the changes in this PR. Could you update the PR description with:

1. A highlight of the changes made.
2. The correct video showcasing the implemented fixes.
3. Also link your PR with the issue

[thepiyush-303]

Hey @thepiyush-303, I noticed that the video you uploaded might not correspond to the changes in this PR. Could you update the PR description with:

1. A highlight of the changes made.

2. The correct video showcasing the implemented fixes.

3. Also link your PR with the issue

Thanks, @abirc8010 for letting me know it was showing now i update it.
also i see a minor css issue i'll commit it soon