[#noissue] Fix filteredMap merge logic

[binDongKim]

• Pass the previous data if there's no data for the same key(agent) in the merging scatter process
• Match servermap data with timestamp, not with the data index
• Consider unauthorized condition only when there is node-list

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.11%. Comparing base (872a36e) to head (0b9b396).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11064      +/-   ##
============================================
- Coverage     37.11%   37.11%   -0.01%     
+ Complexity    11977    11974       -3     
============================================
  Files          3931     3931              
  Lines         96925    96925              
  Branches      10382    10382              
============================================
- Hits          35975    35972       -3     
- Misses        57990    57991       +1     
- Partials       2960     2962       +2     

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[BillionaireDY]

LGTM 👍