test(e2e): traffic route test with default tr policy

[jakubdyszkiewicz]

Checklist prior to review

Because there was no default traffic route policy, we were switching back and forth between old and new xds code path resulting in listener clash (old path uses additional addresses, new does not). It's not 100% clear why exactly this was the cause, but the test is much more stable now. It's not a real world scenario to switch between old and new path very quickly.

I still saw some flake with error code 6. It's a DNS error caused by conntrack which we don't have a fix for #3459 (comment) in universal e2e tests

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --