fix: redis cluster update as scale out

[drivebyer]

Description

Fix redis cluster status not updated when scale out cluster size.

more: it's ok about to remove the statefulset assert step && ping pod step. We can test these only by redis cluster status

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 38.70%. Comparing base (d121d86) to head (068d5a3).
Report is 24 commits behind head on master.

Files	Patch %	Lines
controllers/rediscluster_controller.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #872      +/-   ##
==========================================
+ Coverage   35.20%   38.70%   +3.50%     
==========================================
  Files          19       19              
  Lines        3213     2656     -557     
==========================================
- Hits         1131     1028     -103     
+ Misses       2015     1559     -456     
- Partials       67       69       +2     

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[shubham-cmyk]

Nice work