…G route-map for upstream LC (sonic-net#212)

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### Description of PR
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Summary:
Fixes # (issue)
In addition to the fix provided by sonic-net#15962 for the issue sonic-net#9052, this code change is also needed for handling AZNG route map changes on upstream LC.

### Type of change

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

### Back port request
- [ ] 202012
- [ ] 202205
- [ ] 202305
- [ ] 202311
- [x] 202405
- [x] 202411

### Approach
#### What is the motivation for this PR?

- '_test_default_route_with_bgp_flap_', for msft specific AZNG route maps on upstream LC fails even with the fix provided by sonic-net#15962

#### How did you do it?

- In addition to the fix provided by sonic-net#15962 , handle the case for all route maps.

#### How did you verify/test it?

- Ran the test on T2 chassis with upstream LC, having different sets of route maps and made sure the tests are passing as expected.

#### Any platform specific information?

#### Supported testbed topology if it's a new test case?

### Documentation
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