[action] [PR:21759] Remove xfail conditions for test_everflow_per_interface[ipv6-erspan_i… (sonic-net#1015)

…pv6-default] since it is duplicated with skip condition

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### Description of PR
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Summary:
Fixes # (issue)

### Type of change

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- [ ] Bug fix
- [ ] Testbed and Framework(new/improvement)
- [ ] New Test case
 - [ ] Skipped for non-supported platforms
- [ ] Test case improvement

### Back port request
- [ ] 202205
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [x] 202411
- [x] 202505
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### Approach
#### What is the motivation for this PR?
Remove duplicated xfail, since it should already been cover by the skip condition.
So conditions can be more clear, less confusion and less maintenance.

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Author: mssonicbld

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -1540,12 +1540,6 @@ everflow/test_everflow_per_interface.py::test_everflow_per_interface[ipv6-erspan
     conditions:
       - "platform in ['x86_64-arista_7260cx3_64', 'x86_64-arista_7060_cx32s'] and https://github.com/sonic-net/sonic-mgmt/issues/19096"
       - "platform in ['x86_64-nvidia_sn5640-r0']"
-  xfail:
-    reason: "xfail for IPv6-only topologies, need support for IPv6 bgp. Or test case has issue on the t0-isolated-d256u256s2 topo."
-    conditions_logical_operator: or
-    conditions:
-      - "https://github.com/sonic-net/sonic-mgmt/issues/19096 and '-v6-' in topo_name"
-      - "'t0-isolated-d256u256s2' in topo_name and platform in ['x86_64-nvidia_sn5640-r0']"
 
 everflow/test_everflow_per_interface.py::test_everflow_per_interface[ipv6-m0_l3_scenario]:
   skip: