feat(slack): Add Slack Agent DM and assistant thread support for Seer Explorer #249247

Job	Run time
detect what files changed	40s
backend typing	4m 19s
backend migration tests	9m 6s
cli test	2m 1s
api docs test	5m 48s
monolith-dbs test	7m 3s
select tests	50s
check migration	1m 3s
requirements check	0s
api url typescript generation	0s
calculate test shards	9s
backend test (1)	5m 53s
backend test (2)	5m 45s
backend test (0)	6m 12s
Backend	2s
	48m 51s

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