Fix wrong action IDs in GitLabMergeRequestTrigger.java and add support to "approved" and "unapproved" as well

[mifitous]

modified according to official documentation: https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html#merge-request-events

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[mifitous]

fixed correct action labels based on: https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html#merge-request-events

[mifitous]

Hi @jetersen
rebased on master to avoid the noisy commit history
Thank you

[mifitous]

Documentation reference: https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html#merge-request-events

[mifitous]

Hi @jetersen : It will be very nice if you could review and merge please - it is blocking me for other tasks I must complete ASAP
Thank you !

[mifitous]

Thank you !

…

On Tue, Nov 29, 2022 at 5:24 PM Joseph Petersen ***@***.***> wrote: ***@***.**** approved this pull request. — Reply to this email directly, view it on GitHub <#252 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEA2JGSWQEX2OTL3PL2HABTWKYN4XANCNFSM6AAAAAASKNJWOU> . You are receiving this because you authored the thread.Message ID: ***@***.*** com>

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[jetersen]

@mifitous Thank you too!