chore: support multi-org group sync with runtime configuration (#14578)

- Implement multi-org group sync
- Implement runtime configuration to change sync behavior
- Legacy group sync migrated to new package

coderd/idpsync/organization.go

@@ -16,6 +16,17 @@ import (
 	"github.com/coder/coder/v2/coderd/util/slice"
 )
 
+type OrganizationParams struct {
+	// SyncEnabled if false will skip syncing the user's organizations.
+	SyncEnabled bool
+	// IncludeDefault is primarily for single org deployments. It will ensure
+	// a user is always inserted into the default org.
+	IncludeDefault bool
+	// Organizations is the list of organizations the user should be a member of
+	// assuming syncing is turned on.
+	Organizations []uuid.UUID
+}
+
 func (AGPLIDPSync) OrganizationSyncEnabled() bool {
 	// AGPL does not support syncing organizations.
 	return false