chore(gitlab): Switch to upstream GitLab catalog providers with event support

[jesuino]

Description

Add support to events for Gitlab Org Provider

Which issue(s) does this PR fix

• Fixes RHIDP-2339

To test this follow the steps below:

• Enable the plugin backstage-plugin-catalog-backend-module-gitlab-org-dynamic:

  - package: ./dynamic-plugins/dist/backstage-plugin-catalog-backend-module-gitlab-org-dynamic
    disabled: false

• Have a valid gitlab token
• Fill the catalog with a group. You can use the public group gitlab-org. Bear in mind that this group is huge and take a while to load, hence add a good timeout

Here are the changes to app-config.yaml:

integrations:
  gitlab:
  - apiBaseUrl: https://gitlab.com/api/v4
    host: gitlab.com
    token: ${GITLAB_TOKEN}
catalog:
  import:
    {}
  providers:
    gitlab:
      development:
        group: gitlab-org
        orgEnabled: true
        host: gitlab.com
        rules:
        - allow:
          - Group
          - User
        schedule:
          frequency:
            minutes: 1
          initialDelay:
            seconds: 10
          timeout:
            minutes: 10

In Janus I can see the groups and users loaded in the catalog:

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[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1361!

[openshift-merge-robot]

PR needs rebase.

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[jesuino]

This PR may be obsolete due the update to Backstage 1.27 PR. That PR uses the new plugin "plugin-catalog-backend-module-gitlab-org" on version 0.0.1 and it exports the org provider already with event support.

Could you please confirm @schultzp2020 ? Thanks!

Gitlab Org 0.0.1 provider has Event Support:
https://github.com/backstage/backstage/blob/v1.27.0/plugins/catalog-backend-module-gitlab-org/src/catalogModuleGitlabOrgDiscoveryEntityProvider.ts#L44

Backstage 1.27.0 update changes on gitlab org wrapper:
4c1ee5d#diff-ad768d5b9a811ba84c7e962bba18d96d66f2dba2eb38694cb3b3edab63bcc622R30

[jesuino]

I am closing this PR because this feature was covered by PR 1325.