Resolve "Remove redundant attachment link from video and audio embeds"

What does this MR do and why?

This MR is removing theattachment link from video and audio embeds to reduce user confusion and visual clutter. The current implementation displays cryptic filenames that provide no meaningful value while the native player controls already offer download functionality.

Related issues

Related to #578018

References

Screenshots or screen recordings

Before	After
master-branch-before	Remove-attachement-link

MR acceptance checklist

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