Drop vgopath from API code generation

[afritzler]

Proposed Changes

Use upstream k8s.io/code-generator (kube_codegen.sh) directly instead of synthesizing a virtual GOPATH via vgopath. The codegen tools have been module-aware for a while, so the GOPATH-style layout is no longer needed.

• Remove the VGOPATH variable, install target, and version pin from the Makefile, and drop vgopath as a prerequisite of generate and proto.
• Drop the mktemp + vgopath -o materialization and GOROOT/GOPATH exports from hack/update-codegen.sh; only go mod download remains so go list -m can resolve k8s.io/code-generator.

Generated output (api/, client-go/, internal/apis/, iri/) is byte-identical to before.

Fixes #1478

Summary by CodeRabbit

• Chores
  • Simplified the build toolchain by removing an unused dependency tool and streamlining the module initialization process. Build infrastructure is now leaner with reduced complexity in code generation setup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b4117ada-9500-46d1-8129-e7f93d69f068

📥 Commits

Reviewing files that changed from the base of the PR and between ddfd5b3 and fe91bcb.

📒 Files selected for processing (2)

• Makefile
• hack/update-codegen.sh

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📝 Walkthrough

Walkthrough

This PR removes the vgopath tool from the code generation pipeline. The Makefile targets generate and proto no longer depend on vgopath, and the tool installation machinery is deleted. The hack/update-codegen.sh script is simplified to run module downloads directly without creating a virtual GOPATH context.

Changes

Remove vgopath from code generation pipeline

Layer / File(s)	Summary
Makefile target and tool cleanup Makefile	generate and proto targets drop vgopath from prerequisites; generate now exports MODELS_SCHEMA and OPENAPI_GEN to the script. VGOPATH, VGOPATH_VERSION variables and the vgopath install target are removed entirely.
Script virtual GOPATH removal hack/update-codegen.sh	Virtual GOPATH setup (VIRTUAL_GOPATH, GOROOT, GOPATH exports and cleanup trap) is removed; go mod download now runs directly in PROJECT_ROOT with MODELS_SCHEMA and OPENAPI_GEN preserved in the environment.

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title concisely and accurately summarizes the main change: removing vgopath from the API code generation pipeline.
Description check	✅ Passed	The description follows the template structure with a 'Proposed Changes' section that clearly outlines the modifications, explains the rationale, and references the fixed issue.
Linked Issues check	✅ Passed	The PR successfully addresses all coding-related objectives from issue #1478: removes VGOPATH variable/target/version-pin, drops vgopath prerequisites, simplifies hack/update-codegen.sh, and maintains byte-identical output.
Out of Scope Changes check	✅ Passed	All changes are directly within scope: modifications to Makefile and hack/update-codegen.sh align with the stated objectives of removing vgopath and simplifying the codegen workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch enh/remove-vgopath

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