$author_id in bbp_get_*_revision_log() not respected

[dd32]

bbp_get_reply_revision_log() + bbp_get_topic_revision_log() allows for a revisions author_id to come from the revision meta, however, the function doesn't actually use this saved data at all, instead always using the revisions authorship details.

See ​https://github.com/bbpress/bbPress/blob/4178cbf665674c128c928fabdc0322badacad06b/src/includes/replies/template.php#L751-L759 + ​https://github.com/bbpress/bbPress/blob/4178cbf665674c128c928fabdc0322badacad06b/src/includes/topics/template.php#L915-L923

Discovered while working on ​https://meta.trac.wordpress.org/ticket/7177

The simplest way to reproduce this is to filter bbp_get_reply_raw_revision_log setting the author ID to something different than saved in the DB, and you'll find the output references the original revisions author.

### Summary

This PR fixes an issue where bbp_get_reply_revision_log() and bbp_get_topic_revision_log() would always display the original revision author, even if a different author was set in the revision log meta.

### Details

• The functions now check for an author value in the revision log meta for each revision.
• If present, the log displays the name and link for the meta author; otherwise, it falls back to the original revision's post_author.
• This allows filters (such as on bbp_get_reply_raw_revision_log) to override the displayed author for moderation or other purposes.

### References

• bbPress Trac ​#3579

This isn't quite right, as other bugs are in the way here.

• link_text is not a valid argument in bbp_get_author_link() so it will always fallback
• the $author_id should not be passed into post_id

Fixing this properly will likely require a new function that accepts an author ID instead of a post ID.