Drop v1alpha2 API client

[nak3]

Changes

This patch drops Gateway API v1alpha2 client. The upstream already released GA and v1beta1. v1alpha2 client is no longer necessary.

/kind cleanup

Release Note

NONE

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (4eaa9ba) 73.12% compared to head (447cc0c) 73.12%.

Files	Patch %	Lines
...kg/reconciler/ingress/resources/reference_grant.go	0.00%	11 Missing ⚠️
pkg/reconciler/ingress/reconcile_resources.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #592   +/-   ##
=======================================
  Coverage   73.12%   73.12%           
=======================================
  Files           9        9           
  Lines         692      692           
=======================================
  Hits          506      506           
  Misses        157      157           
  Partials       29       29           

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[nak3]

The code change is 049db33
Rest of the commits are auto-gen by hack/update-codegen.sh and lint fix in script.

[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3, ReToCode

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[ReToCode]

/override "codecov/patch"

[knative-prow]

@ReToCode: Overrode contexts on behalf of ReToCode: codecov/patch

In response to this:

/override "codecov/patch"

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