Revert "retention: Delete objects tied to a Message in one query with archiving."
Revert "retention: Delete objects tied to a Message in one query with archiving."

This reverts commit 8f15884c7d019950d24b7dca51e71b48206c1e81. Using the
WITH ( ) ... DELETE method leads to a small performance drop, while
probably not offering many positives, so it seems appropriate to go to
the simpler case of just letting things get cleaned up by CASCADE.

kou/zulip,brainwane/zulip,brainwane/zulip,showell/zulip,timabbott/zulip,tommyip/zulip,synicalsyntax/zulip,showell/zulip,hackerkid/zulip,rht/zulip,timabbott/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,timabbott/zulip,showell/zulip,zulip/zulip,timabbott/zulip,andersk/zulip,shubhamdhama/zulip,synicalsyntax/zulip,tommyip/zulip,timabbott/zulip,eeshangarg/zulip,punchagan/zulip,tommyip/zulip,eeshangarg/zulip,rishig/zulip,zulip/zulip,rishig/zulip,tommyip/zulip,andersk/zulip,rishig/zulip,shubhamdhama/zulip,synicalsyntax/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,rishig/zulip,brainwane/zulip,brainwane/zulip,punchagan/zulip,kou/zulip,zulip/zulip,rht/zulip,timabbott/zulip,synicalsyntax/zulip,showell/zulip,andersk/zulip,eeshangarg/zulip,shubhamdhama/zulip,rht/zulip,shubhamdhama/zulip,kou/zulip,hackerkid/zulip,brainwane/zulip,rishig/zulip,showell/zulip,kou/zulip,synicalsyntax/zulip,zulip/zulip,shubhamdhama/zulip,tommyip/zulip,rishig/zulip,kou/zulip,shubhamdhama/zulip,kou/zulip,rht/zulip,punchagan/zulip,rishig/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,synicalsyntax/zulip,zulip/zulip,synicalsyntax/zulip,punchagan/zulip,showell/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,shubhamdhama/zulip,showell/zulip,tommyip/zulip,punchagan/zulip,hackerkid/zulip,brainwane/zulip,eeshangarg/zulip,timabbott/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,brainwane/zulip,punchagan/zulip,andersk/zulip