test(e2e): migrate Gateway API tests to e2e_env

[michaelbeaumont]

This doesn't include the conformance tests.

Checklist prior to review

• [x] Link to docs PR or issue --
• [x] Link to UI issue or PR --
• [x] Is the issue worked on linked? -- https://github.com/kumahq/kuma/issues/4520
• [x] Unit Tests --
• [x] E2E Tests --
• [x] Manual Universal Tests --
• [x] Manual Kubernetes Tests --
• [x] Do you need to update UPGRADE.md? --
• [x] Does it need to be backported according to the backporting policy? --

[jakubdyszkiewicz]

The legacy test slice with ./test/e2e/gateway/... ./test/e2e/virtualoutbound/... now takes 16min :) It was ~50min before we started migrating any gateway tests

[codecov-commenter]

Codecov Report

Merging #4796 (7b71d76) into master (9f2ae25) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4796   +/-   ##
=======================================
  Coverage   46.46%   46.46%           
=======================================
  Files         690      690           
  Lines       47115    47115           
=======================================
  Hits        21894    21894           
- Misses      23294    23295    +1     
+ Partials     1927     1926    -1     

Impacted Files	Coverage Δ
pkg/api-server/server.go	74.79% <0.00%> (-2.90%)	:arrow_down:
pkg/core/resources/manager/cache.go	85.71% <0.00%> (-2.60%)	:arrow_down:
pkg/xds/generator/direct_access_proxy_generator.go	90.90% <0.00%> (+1.13%)	:arrow_up:
pkg/defaults/components.go	56.66% <0.00%> (+3.33%)	:arrow_up:
pkg/xds/cache/once/once.go	100.00% <0.00%> (+5.00%)	:arrow_up:
pkg/xds/cache/once/cache.go	94.87% <0.00%> (+12.82%)	:arrow_up:

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[michaelbeaumont]

After changing the port, the e2e tests haven't failed (last 2 pipelines). Merging