Sync to upstream OVN branch-23.09. Below are the commits
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tests: Wait for new ovn-controllers to connect to Southbound.

northd: Reset ls_datapath_group if not all chassis support it.

northd: introduce ls_datapath_group column in lb sb db table

northd: sync lb applied to logical routers in sb db lb table (#2193323)

northd: Avoid snat on reply packets for dgw

northd: Incrementally process SB.Load_balancer updates.

tests: Add missing --wait=sb to the LB I-P test.

system-tests: Make sure that IPv6 address is available right away

Don't mention packet cloning when failing to find tunnel

northd: Allow need frag to be SNATed

docs: require ovn-set-local-ip for co-located ovn-controllers

memory-trim: Fix timestamp overflow warning right after reboot.

Fix missing flows in ls_in_dhcp_options table

controller: throttle port claim attempts from if-status

ci: Free up additional space for ovn-k jobs.