[#9176] Improved code so that connection object of pinot is reused

[minwoo-jung]

No description provided.

[codecov]

Codecov Report

Merging #9177 (da1a0f4) into master (d745085) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head da1a0f4 differs from pull request most recent head 9694d4d. Consider uploading reports for the commit 9694d4d to get more accurate results

@@             Coverage Diff              @@
##             master    #9177      +/-   ##
============================================
- Coverage     39.84%   39.83%   -0.01%     
- Complexity    11748    11750       +2     
============================================
  Files          3361     3362       +1     
  Lines         90639    90654      +15     
  Branches      10085    10086       +1     
============================================
+ Hits          36113    36116       +3     
- Misses        51445    51460      +15     
+ Partials       3081     3078       -3     

Impacted Files	Coverage Δ
...point/metric/common/pinot/PinpointPinotDriver.java	0.00% <0.00%> (ø)
...npoint/metric/web/mybatis/DataSourceDelegator.java	21.42% <ø> (ø)
...t/metric/web/mybatis/PinotConnectionDelegator.java	0.00% <ø> (ø)
...p/pinpoint/rpc/stream/StreamChannelRepository.java	57.89% <0.00%> (-21.06%)	⬇️
...rc/main/java/com/navercorp/pinpoint/test/Item.java	72.22% <0.00%> (ø)
...orp/pinpoint/rpc/server/DefaultPinpointServer.java	81.89% <0.00%> (+0.82%)	⬆️
...om/navercorp/pinpoint/rpc/codec/PacketDecoder.java	53.33% <0.00%> (+1.66%)	⬆️
...vercorp/pinpoint/web/vo/ApplicationAgentsList.java	92.68% <0.00%> (+2.43%)	⬆️
...m/navercorp/pinpoint/rpc/client/ConnectFuture.java	79.16% <0.00%> (+8.33%)	⬆️

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