minor: Rename conversation_diversity to conversation_senders.
minor: Rename conversation_diversity to conversation_senders.

zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,punchagan/zulip,rht/zulip,showell/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,andersk/zulip,punchagan/zulip,zulip/zulip,showell/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,showell/zulip,zulip/zulip,kou/zulip,zulip/zulip,showell/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,kou/zulip,showell/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,kou/zulip,rht/zulip