fix: remove unnecessary waits from e2e tests

[Nashluffy]

Description

For all the tests I've changed, there are existing assertions that the cluster/sentinel/redis is ready, so the sleeps are unnecessary. From the looks of it, they predate the ready assertions.

Partial fix for #1104

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.

Additional Context

It's very possible there's additional context I'm missing on why these sleeps are still in the codebase.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.67%. Comparing base (d121d86) to head (2278d09).
Report is 120 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1106       +/-   ##
===========================================
+ Coverage   35.20%   45.67%   +10.47%     
===========================================
  Files          19       20        +1     
  Lines        3213     2704      -509     
===========================================
+ Hits         1131     1235      +104     
+ Misses       2015     1387      -628     
- Partials       67       82       +15     

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