[default-route-bgp-flap]: [T2] Fix and handle AZNG route-map for upstream LC

[sanjair-git]

Description of PR

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

Type of change

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

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405
• 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 [default-route-bgp-flap]: Fix for 9052 - test failure #15962

How did you do it?

• In addition to the fix provided by [default-route-bgp-flap]: Fix for 9052 - test failure #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

[mssonicbld]

/azp run

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