feat: Add missing event toggles to Group Slack integration

Mohamed Othmanrequested to merge
gitlab-community/gitlab-org/api/client-go:add-event-for-set-slack-integ into main

Description:

Context

This MR completes the SetGroupSlackOptions struct by adding the missing boolean event triggers. Without these fields, users are unable to enable/disable specific notification types via the API.

Changes

Added missing bool pointer fields to SetGroupSlackOptions with appropriate url and json tags.

Expanded TestSetGroupSlackSettings to ensure both the request serialization and the response mapping work as expected for the new fields.

Fixed Issues Closes #2233 (closed)

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