Merge branch 'duo-chat-egs-self-hosted' into 'master'

Add Duo Chat history items on self-hosted models

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/178287



Merged-by: Lorena Ciutacu <lciutacu@gitlab.com>
Approved-by: Torsten Linz <tlinz@gitlab.com>
Approved-by: Lorena Ciutacu <lciutacu@gitlab.com>
Reviewed-by: Torsten Linz <tlinz@gitlab.com>
Reviewed-by: Lorena Ciutacu <lciutacu@gitlab.com>
Co-authored-by: Jonathan Glassman <jglassman@gitlab.com>