chore: update gitlab dependencies to reflect latest webhook payload

[xNok]

🧽 Update or clean up current behavior

The issue mostly lies in using the go-playground/webhooks module, as the event parsing is never up-to-date. In fact, I just realised that I last contributed to it, but I no longer intend to do so because it is much better to use the Gitlab-maintained go-gitlab module.

The new approach should make the event Source compatible with all new event types (it was missing quite a few), and update the go-gitlab modules periodically is all you need to do to support the latest Gitlab development.

I didn't apply it, but it would be nice if the events contained an indication of what version of Gitlab or the go-gitlab module it is using as source, as only getting the benefit if they are up-to-date.

Proposed Changes

• Upgrade go-gitlab (it was relocated to Gitlab)
• Update the Adapter logic to use the go-gitlab module

Release Note

GitlabSource now support all Gitlab Webhook Event Types to their latest version. 

* [EventTypes](https://gitlab.com/gitlab-org/api/client-go/-/blob/main/types.go?ref_type=heads#L693)
* [EventPayloads](https://gitlab.com/gitlab-org/api/client-go/-/blob/main/event_webhook_types.go?ref_type=heads)

You need to update your event Sink dependency to see the results, which might include migrating from `go-playground/webhooks` to `gitlab.com/gitlab-org/api/client-go`. As `go-playground/webhooks` is not keeping up with Gitlab updates.

Docs

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: xNok / name: Alexandre Couedelo (6f6cb1a, 34c6f5f, a76adcf, f3790c0, ade9bd2, 57b860f, 699fd72, 1c3a95a, 91c46df, 0bdcff2, 09abef8, 251c8e7, 584d167, aacad6c, 2da7b1e, 998a65c, b679050, 406fa4f, 11944cb)
• ✅ login: dprotaso / name: Dave Protasowski (1beb0cc)

[knative-prow]

Welcome @xNok! It looks like this is your first PR to knative-extensions/eventing-gitlab 🎉

[PabloPie]

Hi @aslom @pierDipi! Do you think you could have a look at this PR? Thank you!

[codecov]

Codecov Report

❌ Patch coverage is 59.18367% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.96%. Comparing base (3208f7f) to head (1beb0cc).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/adapter/webhook.go	57.44%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
- Coverage   37.09%   36.96%   -0.13%     
==========================================
  Files          19       20       +1     
  Lines         736      752      +16     
==========================================
+ Hits          273      278       +5     
- Misses        454      461       +7     
- Partials        9       13       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Cali0707]

Thanks for working on updating this @xNok !

Would you be able to fix the linter errors re: the license boilerplate in the new webhook.go file?

Overall, this PR looks good to me otherwise. Have you managed to test it in a k8s cluster and see if events show up from the webhook?

[xNok]

Thanks for having a look, I will get back to it on Friday for further testing and wrap this up

[xNok]

@Cali0707 I have updated the license in the webhook.go and, more importantly, implemented e2e tests for the webhook reciever part.

I am running the e2e test against the knative quickstart kind cluster, I didn't hook it to the `presubmit-tests.sh

[Cali0707]

Overall this looks good to me, with a few small nits

/lgtm
/cc @creydr

[Copilot]

Pull Request Overview

This PR modernizes GitLab webhook integration by migrating from the outdated go-playground/webhooks module to the officially maintained gitlab.com/gitlab-org/api/client-go module, ensuring support for all current GitLab webhook event types.

• Replaces go-playground/webhooks dependency with the official GitLab Go client
• Updates webhook parsing logic to use GitLab's official event types and payloads
• Adds comprehensive end-to-end tests with real webhook payload examples

Reviewed Changes

Copilot reviewed 19 out of 267 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
go.mod	Updates dependencies to use gitlab.com/gitlab-org/api/client-go v0.129.0
pkg/adapter/webhook.go	New webhook handler implementation using official GitLab client
pkg/adapter/receive_adapter.go	Simplified adapter logic using new webhook handler
pkg/adapter/receive_adapter_test.go	Updated tests for new event types and error handling
pkg/client/gitlab/webhook_client.go	Updated GitLab client usage with new API patterns
pkg/reconciler/source/gitlabsource.go	Updated import to use official GitLab client
config/300-gitlabsource.yaml	Added support for new event types (feature_flag, job, release, resource_access_token)
test/	New end-to-end integration tests with webhook payload examples

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[xNok]

@Cali0707, it took me some time to get back to it, I rebased this MR on main

[dprotaso]

I rebased the PR

[Cali0707]

/lgtm

Thanks for the PR @xNok

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, xNok

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [Cali0707]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment