fix: return ASAP after handling finalizer

[drivebyer]

Description

Fixes #801

After we update the resource, we should return as soon as possible. Otherwise, we will get a conflict error when doing the next update.

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

[codecov]

Codecov Report

Attention: Patch coverage is 5.88235% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 38.96%. Comparing base (d121d86) to head (1e53480).
Report is 52 commits behind head on master.

Files	Patch %	Lines
controllers/redis_controller.go	0.00%	3 Missing and 1 partial ⚠️
controllers/rediscluster_controller.go	20.00%	3 Missing and 1 partial ⚠️
controllers/redisreplication_controller.go	0.00%	3 Missing and 1 partial ⚠️
controllers/redissentinel_controller.go	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #940      +/-   ##
==========================================
+ Coverage   35.20%   38.96%   +3.76%     
==========================================
  Files          19       20       +1     
  Lines        3213     2728     -485     
==========================================
- Hits         1131     1063      -68     
+ Misses       2015     1594     -421     
- Partials       67       71       +4     

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