refactor: LivechatDepartmentAgents out of DB Watcher

[ricardogarim]

As per the updates mentioned in PROJ-7, SCA-8 and ADR #74, this pull request focuses on relocating LivechatDepartmentAgents model out of DB Watcher service.

Context

This modification enhances RocketChat's app by allowing it to directly call listeners through the api.broadcast global function, bypassing the need for MongoDB Change Stream data propagation.

This change offers better control over user notifications via Web Sockets, enabling more precise management of use-cases. Instead of notifying every database change, we can now send an api.broadcast call only when necessary, reducing overall network messages. Additionally, this contributes to the future removal of the DB Watcher deployment, optimizing resource utilization.

Proposed changes

Key changes include:

• Conditionally incorporating LivechatDepartmentAgents entity import within DB watchers on application startup based on the dbWatchersDisabled flag.
• Enabling support for the following use cases to directly trigger watch.livechatDepartmentAgents listener event, subject to the dbWatchersDisabled flag.

Updated Use Cases

Use Case	Route/Trigger	Notes
Delete user	POST Meteor method deleteUser
Delete user own account	POST Meteor method deleteUserOwnAccount
App bridge delete user actions	On app bridge deleteUser function
Remove agent	On callback livechat.afterAgentRemoved triggered by DELETE /api/v1/livechat/users/:type/:_id POST Meteor method livechat:removeAgent
Archive/Unarchive department	POST /api/v1/livechat/department/:_id/archive POST /api/v1/livechat/department/:_id/unarchive
Remove department	POST Meteor method livechat:removeDepartment DELETE /api/v1/livechat/department/:_id

Steps to test or reproduce

1. Start RocketChat's application with the DISABLE_DB_WATCHERS environment variable set to true.
2. Perform HTTP requests or simulate use cases listed in the above table.

Further comments

To maintain consistency and avoid potential regressions, event names and signatures have been kept unchanged on both the client and app sides. This decision streamlines efforts and mitigates the risk of unintended consequences.

Additionally, some new model functions have been created to accommodate specific needs when dealing with database operations, such as LivechatDepartmentAgents.findAgentsByAgentsAndDepartmentId.

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 6.10.0, but it targets 6.9.0

Please fix the issues and try again

If you have any trouble, please check the PR guidelines

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[codecov]

Codecov Report

Attention: Patch coverage is 16.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 56.36%. Comparing base (3da6e14) to head (9dd3ad1).

Additional details and impacted files

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- Misses       20791    20796       +5     
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Flag	Coverage Δ
e2e	56.12% <ø> (+0.04%)	⬆️
unit	72.06% <0.00%> (-0.14%)	⬇️

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fixed