Support setting a shielded address as refund target

.changelog/unreleased/features/4082-ibc-pfm.md

@@ -0,0 +1,3 @@
+- Implement compatibility with Strangelove's Packet Forward Middleware
+  in Namada, to allow forwarding ICS-20 packets over multiple chains.
+  ([\#4082](https://github.com/anoma/namada/pull/4082))

.changelog/unreleased/features/4134-ibc-pfm-with-invalid-addrs.md

@@ -0,0 +1,2 @@
+- Disable validation of IBC ICS-20 receivers, while handling PFM packets.
+  ([\#4134](https://github.com/anoma/namada/pull/4134))

.changelog/unreleased/features/4168-ibc-shielded-refund.md

@@ -0,0 +1,2 @@
+- Support a shielded address for the refund target when IBC transfer failure or
+  timeout ([\#4168](https://github.com/anoma/namada/issues/4168))

.github/workflows/scripts/e2e.json

@@ -6,6 +6,8 @@
     "e2e::ibc_tests::fee_payment_with_ibc_token": 357,
     "e2e::ibc_tests::ibc_token_inflation": 840,
     "e2e::ibc_tests::ibc_rate_limit": 485,
+    "e2e::ibc_tests::ibc_pfm_happy_flows": 485,
+    "e2e::ibc_tests::ibc_pfm_unhappy_flows": 485,
     "e2e::ibc_tests::ibc_upgrade_client": 280,
     "e2e::eth_bridge_tests::test_add_to_bridge_pool": 10,
     "e2e::ledger_tests::double_signing_gets_slashed": 12,