tests/e2e: move tcp test to own file and test permissive mode

[shashankram]

Description:
Moves the TCP traffic test to its own file and adds a scenario
to test traffic in permissive mode.

Part of #1521

Affected area:

• New Functionality [ ]
• Documentation [ ]
• Install [ ]
• Control Plane [ ]
• CLI Tool [ ]
• Certificate Management [ ]
• Networking [ ]
• Metrics [ ]
• SMI Policy [ ]
• Security [ ]
• Tests [X]
• CI System [ ]
• Performance [ ]
• Other [ ]

Please answer the following questions with yes/no.

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?
  No

[codecov-io]

Codecov Report

Merging #2227 (e75b6d0) into main (4defb02) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2227   +/-   ##
=======================================
  Coverage   57.73%   57.73%           
=======================================
  Files         145      145           
  Lines        6299     6299           
=======================================
  Hits         3637     3637           
  Misses       2658     2658           
  Partials        4        4           

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[ksubrmnn]

Is there a reason that the client pod is not behind a service?

[shashankram]

Is there a reason that the client pod is not behind a service?

Yes, because client pods in kubernetes don't have to be backed by services. We had the limitation to create services for clients which has been removed, so it makes sense to test it the way real users would wire up their apps, which is without needing to create a service for client pods.

There are a few other tests that create services for client, but it didn't make sense to replicate this for all tests since we aren't testing anything additional.