test: Chat limits flaky test

[KevLehman]

Proposed changes (including videos or screenshots)

Issue(s)

https://rocketchat.atlassian.net/browse/CTZ-99

Steps to test or reproduce

Further comments

Changing the queue to run every 3 seconds should make the waits more predictable. Tried with 2 and 4 seconds and 3 was a sweet spot.

Problem with test is that for some slowliness, the server was taking a bit more than 5s to assign the chat, which made the server request the room just before it was assigned.

(Note: not that i like playing with timers & waits... but since waiting queue is based on time we have to sadly wait to test it works...)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.17%. Comparing base (996f5b9) to head (d80a01e).
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Additional details and impacted files

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##           develop   #35848   +/-   ##
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  Coverage    61.17%   61.17%           
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