Merge pull request #2576 from valentinewallace/2023-09-fix-outbound-bp-fail-ev

Fix `PaymentPathFailed::payment_failed_permanently` on blinded path fail

diff --cc lightning/src/ln/onion_route_tests.rs
Simple merge

diff --cc lightning/src/ln/onion_utils.rs
Simple merge

diff --cc lightning/src/ln/outbound_payment.rs
Simple merge