[#11503] Remove duplicate code in SimpleCache

[emeroad]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Project coverage is 37.08%. Comparing base (ed3b57c) to head (9697d69).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...navercorp/pinpoint/profiler/cache/SimpleCache.java	85.71%	2 Missing ⚠️
...pinpoint/profiler/test/MockApiMetaDataService.java	0.00%	1 Missing ⚠️
.../com/navercorp/pinpoint/profiler/cache/Result.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11504      +/-   ##
============================================
- Coverage     37.10%   37.08%   -0.03%     
+ Complexity    12193    12186       -7     
============================================
  Files          4014     4013       -1     
  Lines         98632    98594      -38     
  Branches      10423    10419       -4     
============================================
- Hits          36600    36563      -37     
  Misses        59050    59050              
+ Partials       2982     2981       -1     

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