[ISSUE #9980] Skip invalid records when the group is absent in Pop

[lizhimins]

Which Issue(s) This PR Fixes

Fixes #9980

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.15385% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.73%. Comparing base (1117ab8) to head (db37623).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...apache/rocketmq/broker/pop/PopConsumerService.java	55.55%	1 Missing and 3 partials ⚠️
.../java/org/apache/rocketmq/common/BrokerConfig.java	25.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9981      +/-   ##
=============================================
- Coverage      48.85%   48.73%   -0.12%     
+ Complexity     12769    12744      -25     
=============================================
  Files           1324     1324              
  Lines          96405    96415      +10     
  Branches       12434    12437       +3     
=============================================
- Hits           47094    46988     -106     
- Misses         43568    43667      +99     
- Partials        5743     5760      +17     

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[lollipopjin]

LGTM