feat(gateway-api): Add custom backendRef and filters support for HTTPRoute - Unit Tests

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I started working from feat(gateway-api): Add custom backendRef and filters support for HTTPRoute.

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🔄 2 test files added.
🐛 No bugs detected in your changes
🛠️ 407/407 tests passed

🔄 Test Updates

I've added 2 tests. They all pass ☑️
New Tests:

• pkg/apis/flagger/v1beta1/canary_test.go
• pkg/apis/flagger/v1beta1/zz_generated.deepcopy_test.go

No existing tests required updates.

🐛 Bug Detection

No bugs detected in your changes. Good job!

☂️ Coverage Improvements

Coverage improvements by file:

• pkg/apis/flagger/v1beta1/canary_test.go

  New coverage: 100.00%
  Improvement: +100.00%

• pkg/apis/flagger/v1beta1/zz_generated.deepcopy_test.go

  New coverage: 81.49%
  Improvement: +81.49%

🎨 Final Touches

• I ran the hooks included in the pre-commit config.

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