✨ Add kubebuilderVersion field to PROJECT file

[vitorfloriano]

This PR adds a new field to the PROJECT file: kubebuilderVersion.

Additionally, it updates the documentation in the Project Configuration Reference to include the new kubebuilderVersion field.

It also updates the PROJECT file scaffolded in the docs and in testdata.

Closes: #4398

Test Steps:

1. Build a snapshot release using GoReleaser:

~/kubebuilder$ goreleaser release --snapshot --skip=publish -f ./build/.goreleaser.yml

2. Create a new test project directory:

mkdir -p ~/projects/test-project-file && cd ~/projects/test-project-file

3. Initialize the test project using the Kubebuilder snapshot:

~/kubebuilder/dist/kubebuilder_linux_amd64_v1/kubebuilder init --domain example.com --repo github.com/test/example-operator

4. Verify the generated PROJECT file:

$ cat PROJECT
# Code generated by tool. DO NOT EDIT.
# This file is used to track the info used to scaffold your project
# and allow the plugins properly work.
# More info: https://book.kubebuilder.io/reference/project-config.html
domain: example.com
kubebuilderVersion: 4.5.1-SNAPSHOT-07689e23e
layout:
- go.kubebuilder.io/v4
projectName: test-project-file
repo: github.com/test/example-operator
version: "3"

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vitorfloriano
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[k8s-ci-robot]

Hi @vitorfloriano. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[camilamacedo86]

Terrific 🎉 . Thank you a lot for your contribution 🥇

[vitorfloriano]

Should we change this to CliVersion as well? (and keep the tag)

[camilamacedo86]

I know we said in the issue to be KubebuilderVersion, but because other projects can use it as a lib. I think a generic name might be better.