fix: cascade delete affiliation overrides when member is deleted (#4406)

Signed-off-by: Yeganathan S <63534555+skwowet@users.noreply.github.com>

Author: skwowet

backend/src/database/migrations/V1785226126__cascade_delete_memberOrganizationAffiliationOverrides_on_member.sql

@@ -0,0 +1,8 @@
+alter table "memberOrganizationAffiliationOverrides"
+  drop constraint if exists "memberOrganizationAffiliationOverrides_memberId_fkey";
+
+alter table "memberOrganizationAffiliationOverrides"
+  add constraint "memberOrganizationAffiliationOverrides_memberId_fkey"
+  foreign key ("memberId")
+  references members (id)
+  on delete cascade;