WIP 🐛fix(alpha update): license boilerplate

[camilamacedo86]

When we run alpha generate, it warns because the license has not been used.

Problem

When I was testing it out I saw:

INFO Writing scaffold for you to edit... 
WARN unable to find boilerplate file. This file is used to generate the license header in the project..
Note that controller-gen will also use this. Ensure that you add the license file or configure your project accordingly file_path=hack/boilerplate.go.txterror=open hack/boilerplate.go.txt: no such file or director

Example: https://github.com/camilamacedo86/test-operator/actions/runs/25160729772/job/73754189181

The file should be found.

So, this PR fix it for alpha generate.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86

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[Copilot]

Pull request overview

This PR addresses alpha generate warnings during the internal update flow by preserving the existing license boilerplate (hack/boilerplate.go.txt) across the branch cleanup/regeneration cycle.

Changes:

• Preserve hack/boilerplate.go.txt before cleanup and restore it before running alpha generate during both ancestor and upgrade branch preparation.
• Add integration tests covering boilerplate preservation/restoration behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
internal/cli/alpha/internal/update/update.go	Adds boilerplate preserve/restore helpers and wires them into ancestor/upgrade branch preparation.
internal/cli/alpha/internal/update/update_test.go	Adds integration tests validating boilerplate preservation and restore behavior.

[k8s-ci-robot]

@camilamacedo86: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubebuilder-e2e-k8s-1-36-0	d49b8b4	link	true	/test pull-kubebuilder-e2e-k8s-1-36-0

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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