[Test Gap] Add a test script to cover show ip bgp nettwork

[ZhaohuiS]

Description of PR

Summary:
Fixes # (issue)
Address test gap #5069

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405

Approach

What is the motivation for this PR?

To address test gap #5069

How did you do it?

1. Compare the output of show ip bgp network and docker exec -i bgp vtysh -c "show bgp ipv4 all"
2. Compare the routes and total path value is equal or not for both command
3. Both cover ipv4 and ipv6 command.

How did you verify/test it?

Run bgp/test_bgp_command.py

Any platform specific information?

All platforms

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

All topologies

Documentation