Fix: support Gateway API v1.3.0

[zhaohuabing]

This PR adds support for the Gateway API v1.3.0 experimental channel CRDs in the main branch.

The only CRD that requires backward compatibility handling is BackendTLSPolicy, which has graduated from v1alpha3 to the standard channel (v1).

It also adds e2e tests for Gateway API v1.3.0.

We do not add tests for v1.4.0, since there are no API changes between Gateway API v1.4.0 and v1.4.1—the latter only includes a bug fix related to the BackendTLSPolicy status.

Fixes: #7709

[codecov]

Codecov Report

❌ Patch coverage is 24.59016% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.66%. Comparing base (fe57c70) to head (3023af8).
⚠️ Report is 181 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/provider/kubernetes/controller.go	36.11%	37 Missing and 9 partials ⚠️
internal/provider/kubernetes/indexers.go	2.38%	40 Missing and 1 partial ⚠️
internal/provider/kubernetes/predicates.go	37.50%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7835      +/-   ##
==========================================
- Coverage   72.77%   72.66%   -0.12%     
==========================================
  Files         235      235              
  Lines       35092    35181      +89     
==========================================
+ Hits        25538    25563      +25     
- Misses       7738     7802      +64     
  Partials     1816     1816              

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[zhaohuabing]

Close this in favor of #7523

[zhaohuabing]

Reopen this as a draft, we might want to test Gateway v1.3.0 CRDs with EG v1.6 if we'd like to officially support multiple Gateway API versions.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. Please feel free to give a status update now, ping for review, when it's ready. Thank you for your contributions!

[zhaohuabing]

Closing this as it can break the upgrade path from experimental to standard channel.