[ISSUE #8651] Fix revive topic process lag metric calculation

[redlsz]

Which Issue(s) This PR Fixes

Fixes #8651

Brief Description

Lag is maxQueueOffset plus nextPullOffset

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.20%. Comparing base (0b0f8ec) to head (bc8b319).

Files with missing lines	Patch %	Lines
...he/rocketmq/broker/processor/PopReviveService.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8652      +/-   ##
=============================================
- Coverage      47.26%   47.20%   -0.06%     
+ Complexity     11487    11470      -17     
=============================================
  Files           1277     1277              
  Lines          89432    89432              
  Branches       11502    11502              
=============================================
- Hits           42272    42220      -52     
- Misses         41953    41997      +44     
- Partials        5207     5215       +8     

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