chore!: Remove deprecated livechat methods & api endpoints

[MartinSchoeler]

Proposed changes (including videos or screenshots)

Issue(s)

ARCH-1755

Steps to test or reproduce

Further comments

https://rocketchat.atlassian.net/browse/CTZ-71
https://rocketchat.atlassian.net/browse/CTZ-57
https://rocketchat.atlassian.net/browse/CTZ-75
https://rocketchat.atlassian.net/browse/CTZ-55
https://rocketchat.atlassian.net/browse/CTZ-54

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[changeset-bot]

🦋 Changeset detected

Latest commit: b52756f

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

This PR includes changesets to release 38 packages

Name	Type
@rocket.chat/meteor	Major
@rocket.chat/ddp-client	Major
@rocket.chat/livechat	Patch
@rocket.chat/mock-providers	Patch
@rocket.chat/ui-contexts	Major
@rocket.chat/ddp-streamer	Patch
@rocket.chat/uikit-playground	Patch
@rocket.chat/fuselage-ui-kit	Major
@rocket.chat/gazzodown	Major
@rocket.chat/ui-avatar	Major
@rocket.chat/ui-client	Major
@rocket.chat/ui-video-conf	Major
@rocket.chat/ui-voip	Major
@rocket.chat/web-ui-registration	Major
@rocket.chat/core-typings	Major
@rocket.chat/rest-typings	Major
@rocket.chat/api-client	Patch
@rocket.chat/apps	Patch
@rocket.chat/core-services	Patch
@rocket.chat/cron	Patch
@rocket.chat/freeswitch	Patch
@rocket.chat/http-router	Patch
@rocket.chat/model-typings	Patch
@rocket.chat/account-service	Patch
@rocket.chat/authorization-service	Patch
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/presence-service	Patch
@rocket.chat/queue-worker	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/network-broker	Patch
@rocket.chat/omni-core-ee	Patch
@rocket.chat/instance-status	Patch
@rocket.chat/omni-core	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.02%. Comparing base (e0300aa) to head (b52756f).
⚠️ Report is 1 commits behind head on release-8.0.0.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-8.0.0   #36836      +/-   ##
=================================================
- Coverage          66.44%   66.02%   -0.43%     
=================================================
  Files               3280     3203      -77     
  Lines             109743   108474    -1269     
  Branches           20876    20562     -314     
=================================================
- Hits               72921    71619    -1302     
- Misses             34163    34257      +94     
+ Partials            2659     2598      -61     

Flag	Coverage Δ
e2e	56.33% <ø> (-1.54%)	⬇️
unit	71.51% <ø> (-0.06%)	⬇️

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