feat: Allow admins to control if visitors can close omnichannel conversations

[KevLehman]

Proposed changes (including videos or screenshots)

Visitors have always had the ability of closing ongoing conversations. This, however, means a visitor can close a conversation before it has been served or before an automation process has finished on customer side, which can cause issues.

New setting Allow visitors to finish conversations is created with this purpose. By default, the same behavior will be kept, where visitors can close conversations. When the setting is off, visitors won't see the button to close a conversation and the API will throw an error for them. This doesn't affect agent's capabilities of closing conversations.

Issue(s)

https://rocketchat.atlassian.net/browse/CORE-632

Steps to test or reproduce

Further comments

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[changeset-bot]

🦋 Changeset detected

Latest commit: a18669d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 34 packages

Name	Type
@rocket.chat/meteor	Minor
@rocket.chat/i18n	Minor
@rocket.chat/livechat	Minor
@rocket.chat/mock-providers	Patch
@rocket.chat/ui-contexts	Major
@rocket.chat/web-ui-registration	Major
@rocket.chat/fuselage-ui-kit	Major
@rocket.chat/ui-client	Major
@rocket.chat/gazzodown	Major
@rocket.chat/ui-avatar	Major
@rocket.chat/ui-video-conf	Major
@rocket.chat/uikit-playground	Patch
@rocket.chat/core-typings	Minor
@rocket.chat/rest-typings	Minor
@rocket.chat/api-client	Patch
@rocket.chat/apps	Patch
@rocket.chat/core-services	Patch
@rocket.chat/cron	Patch
@rocket.chat/ddp-client	Patch
@rocket.chat/model-typings	Patch
@rocket.chat/account-service	Patch
@rocket.chat/authorization-service	Patch
@rocket.chat/ddp-streamer	Patch
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/presence-service	Patch
@rocket.chat/queue-worker	Patch
@rocket.chat/stream-hub-service	Patch
@rocket.chat/license	Patch
@rocket.chat/omnichannel-services	Patch
@rocket.chat/pdf-worker	Patch
@rocket.chat/presence	Patch
rocketchat-services	Patch
@rocket.chat/models	Patch
@rocket.chat/instance-status	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.32%. Comparing base (06dbf72) to head (a18669d).
Report is 1 commits behind head on develop.

Additional details and impacted files

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  Coverage    59.32%   59.32%           
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  Files         2548     2548           
  Lines        63415    63415           
  Branches     14268    14268           
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  Hits         37622    37622           
  Misses       23090    23090           
  Partials      2703     2703           

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