fix: fix slice init length (#8707)

# Which Problems Are Solved

The intention here should be to initialize a slice with a capacity of
len(queriedOrgs.Orgs) rather than initializing the length of this slice.

the online demo: https://go.dev/play/p/vNUPNjdb2gJ

# How the Problems Are Solved

use `processedOrgs := make([]string, 0, len(queriedOrgs.Orgs))`

# Additional Changes

None

# Additional Context

None

Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
(cherry picked from commit 69e9926bcc)

internal/api/grpc/admin/export.go

@@ -42,7 +42,7 @@ func (s *Server) ExportData(ctx context.Context, req *admin_pb.ExportDataRequest
 	}
 
 	orgs := make([]*admin_pb.DataOrg, len(queriedOrgs.Orgs))
-	processedOrgs := make([]string, len(queriedOrgs.Orgs))
+	processedOrgs := make([]string, 0, len(queriedOrgs.Orgs))
 	processedProjects := make([]string, 0)
 	processedGrants := make([]string, 0)
 	processedUsers := make([]string, 0)