Add emoji webhooks

What does this MR do and why?

Add emoji webhooks

Changelog: added

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

{
  "object_kind": "emoji",
  "event_type": "award",
  "user": {
    "id": 1,
    "name": "Blake Bergstrom",
    "username": "root",
    "avatar_url": "http://gdk.test:3000/uploads/-/system/user/avatar/1/avatar.png",
    "email": "[REDACTED]"
  },
  "project_id": 6,
  "project": {
    "id": 6,
    "name": "Flight",
    "description": "Velit fugit aperiam illum deleniti odio sequi.",
    "web_url": "http://gdk.test:3000/flightjs/Flight",
    "avatar_url": null,
    "git_ssh_url": "ssh://git@gdk.test:2222/flightjs/Flight.git",
    "git_http_url": "http://gdk.test:3000/flightjs/Flight.git",
    "namespace": "Flightjs",
    "visibility_level": 20,
    "path_with_namespace": "flightjs/Flight",
    "default_branch": "master",
    "ci_config_path": null,
    "homepage": "http://gdk.test:3000/flightjs/Flight",
    "url": "ssh://git@gdk.test:2222/flightjs/Flight.git",
    "ssh_url": "ssh://git@gdk.test:2222/flightjs/Flight.git",
    "http_url": "http://gdk.test:3000/flightjs/Flight.git"
  },
  "object_attributes": {
    "user_id": 1,
    "created_at": "2023-07-04 20:44:11 UTC",
    "id": 1,
    "name": "thumbsup",
    "awardable_type": "Note",
    "awardable_id": 363,
    "updated_at": "2023-07-04 20:44:11 UTC",
    "action": "award",
    "url": "http://gdk.test:3000/flightjs/Flight/-/issues/42#note_363"
  },
  "note": {
    "attachment": null,
    "author_id": 1,
    "change_position": null,
    "commit_id": null,
    "created_at": "2023-07-04 15:09:55 UTC",
    "discussion_id": "c3d97fd471f210a5dc8b97a409e3bea95ee06c14",
    "id": 363,
    "line_code": null,
    "note": "Testing 123",
    "noteable_id": 635,
    "noteable_type": "Issue",
    "original_position": null,
    "position": null,
    "project_id": 6,
    "resolved_at": null,
    "resolved_by_id": null,
    "resolved_by_push": null,
    "st_diff": null,
    "system": false,
    "type": null,
    "updated_at": "2023-07-04 19:58:46 UTC",
    "updated_by_id": null,
    "description": "Testing 123",
    "url": "http://gdk.test:3000/flightjs/Flight/-/issues/42#note_363"
  },
  "issue": {
    "author_id": 1,
    "closed_at": null,
    "confidential": false,
    "created_at": "2023-07-04 14:59:43 UTC",
    "description": "Issue description!",
    "discussion_locked": null,
    "due_date": null,
    "id": 635,
    "iid": 42,
    "last_edited_at": null,
    "last_edited_by_id": null,
    "milestone_id": null,
    "moved_to_id": null,
    "duplicated_to_id": null,
    "project_id": 6,
    "relative_position": 18981,
    "state_id": 1,
    "time_estimate": 0,
    "title": "New issue!",
    "updated_at": "2023-07-04 15:09:55 UTC",
    "updated_by_id": null,
    "weight": null,
    "health_status": null,
    "url": "http://gdk.test:3000/flightjs/Flight/-/issues/42",
    "total_time_spent": 0,
    "time_change": 0,
    "human_total_time_spent": null,
    "human_time_change": null,
    "human_time_estimate": null,
    "assignee_ids": [
      1
    ],
    "assignee_id": 1,
    "labels": [

    ],
    "state": "opened",
    "severity": "unknown"
  }
}

Migrations

lee@Lees-MBP gitlab % bundle exec rake db:migrate:up VERSION=20230615200434 RAILS_ENV=development
main: == [advisory_lock_connection] object_id: 221540, pg_backend_pid: 33092
main: == 20230615200434 AddEmojiEventsToWebHooks: migrating =========================
main: -- add_column(:web_hooks, :emoji_events, :boolean, {:null=>false, :default=>false})
main:    -> 0.0159s
main: == 20230615200434 AddEmojiEventsToWebHooks: migrated (0.0561s) ================

main: == [advisory_lock_connection] object_id: 221540, pg_backend_pid: 33092

lee@Lees-MBP gitlab % bundle exec rake db:migrate:down VERSION=20230615200434 RAILS_ENV=development 
main: == [advisory_lock_connection] object_id: 221620, pg_backend_pid: 32589
main: == 20230615200434 AddEmojiEventsToWebHooks: reverting =========================
main: -- remove_column(:web_hooks, :emoji_events, :boolean, {:null=>false, :default=>false})
main:    -> 0.0045s
main: == 20230615200434 AddEmojiEventsToWebHooks: reverted (0.0118s) ================

main: == [advisory_lock_connection] object_id: 221620, pg_backend_pid: 32589

How to set up and validate locally

1. Setup a group and or project webhook (I normally use the address https://example.local/test)- be sure to select Emoji events
2. Award and revoke some emojis to issues/merge requests/snippets/notes
3. Check the webhook logs

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Approvals

area	reviewer	maintainer
documentation	-	✅ @ashrafkhamis
database	✅ @l.rosa	✅ @stomlinson
backend	✅ @eugielimpin	✅ @ahmed.hemdan
frontend	✅ @dzubova	✅ @afontaine
groupimport and integrate	-	✅ @.luke
test	-	✅ @eugielimpin

Related to #290773 (closed)