Add call to forget matrix API for past session deletion #5969

Job	Run time
Check which packages changed	0s
AI bot Tests	41s
Boxel Motion Tests	1m 18s
Boxel UI Tests	1m 24s
Host Tests	11m 29s
Lint	1m 56s
Matrix Client Tests - Group 1	12m 40s
Matrix Client Tests - Group 2	11m 38s
Realm Server Tests	5m 1s
deploy-ai-bot	0s
Deploy boxel to staging	0s
	46m 7s

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