Remove neutron_tempest_plugin.scenario.test_port_forwardings from skiplist

Removed below tests from skiplist
1. neutron_tempest_plugin.scenario.test_port_forwardings.PortForwarding
   TestJSON.test_port_forwarding_editing_and_deleting_udp_rule
2. neutron_tempest_plugin.scenario.test_port_forwardings.PortForwardingT
   estJSON.test_port_forwarding_to_2_servers

Bug link: https://bugs.launchpad.net/tripleo/+bug/1918597

Closes-Bug: #1918597
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-os_tempest/+/780588
Change-Id: Ia09abf75edf8a16a4bb80d4f0b28a8818439df03

roles/validate-tempest/vars/tempest_skip.yml

@@ -1812,26 +1812,6 @@ known_failures:
     jobs:
       - periodic-tripleo-ci-centos-8-ovb-3ctlr_1comp-featureset035-ussuri
       - tripleo-ci-centos-8-ovb-3ctlr_1comp-featureset035
-  - test: neutron_tempest_plugin.scenario.test_port_forwardings.PortForwardingTestJSON.test_port_forwarding_editing_and_deleting_udp_rule
-    deployment:
-      - overcloud
-    releases:
-      - name: master
-        reason: RuntimeError
-        lp: https://bugs.launchpad.net/tripleo/+bug/1918597
-    jobs:
-      - periodic-tripleo-ci-centos-8-standalone-full-tempest-scenario-master
-      - periodic-tripleo-ci-centos-8-ovb-1ctlr_2comp-featureset020-master
-  - test: neutron_tempest_plugin.scenario.test_port_forwardings.PortForwardingTestJSON.test_port_forwarding_to_2_servers
-    deployment:
-      - overcloud
-    releases:
-      - name: master
-        reason: testtools.matchers._impl.MismatchError
-        lp: https://bugs.launchpad.net/tripleo/+bug/1918597
-    jobs:
-      - periodic-tripleo-ci-centos-8-standalone-full-tempest-scenario-master
-      - periodic-tripleo-ci-centos-8-ovb-1ctlr_2comp-featureset020-master
   - test: tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_cold_migration
     deployment:
       - overcloud