refactor!: removed roomNameExists method

[abhinavkrin]

Proposed changes (including videos or screenshots)

Removed roomNameExists method as it has been replaced by rooms.nameExists endpoint

Issue(s)

Steps to test or reproduce

Further comments

CORE-351

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.39%. Comparing base (8c447cf) to head (f423b64). Report is 5 commits behind head on release-7.0.0.

Additional details and impacted files

@@              Coverage Diff               @@
##           release-7.0.0   #32484   +/-   ##
==============================================
  Coverage          59.39%   59.39%           
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  Files               2541     2541           
  Lines              63175    63175           
  Branches           14220    14220           
==============================================
  Hits               37525    37525           
  Misses             22935    22935           
  Partials            2715     2715           

Flag	Coverage Δ
unit	76.02% <ø> (ø)

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[abhinavkrin]

Can we take a look at this test case? I think there's something weird since it's expecting an error when no room is found...

https://github.com/RocketChat/Rocket.Chat/blob/develop/apps/meteor/tests/end-to-end/api/09-rooms.js#L425

I looked at it, the test was for an invalid roomId which should not be there as we dont accept a roomId for this endpoint. So I changed this test to check for invalid params which makes the test more clear. Also, I added a test to check if false is returned if roomName is not found.