[ISSUE #7821] Add notifyLast flag for PopLongPollingService

[drpmma]

Which Issue(s) This PR Fixes

Fixes #7821

Brief Description

Add notifyLast flag for PopLongPollingService

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (d9526e7) 43.00% compared to head (01feb54) 42.95%.
Report is 7 commits behind head on develop.

Files	Patch %	Lines
...etmq/broker/longpolling/PopLongPollingService.java	18.18%	9 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7835      +/-   ##
=============================================
- Coverage      43.00%   42.95%   -0.06%     
+ Complexity      9919     9907      -12     
=============================================
  Files           1190     1190              
  Lines          85948    85988      +40     
  Branches       11074    11080       +6     
=============================================
- Hits           36964    36932      -32     
- Misses         44411    44479      +68     
- Partials        4573     4577       +4     

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[lollipopjin]

LGTM