[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 2 lines in your changes missing coverage. Please review.

Project coverage is 50.75%. Comparing base (0b0f8ec) to head (bc8b319). Report is 235 commits behind head on develop.

Files with missing lines	Patch %	Lines
...he/rocketmq/broker/processor/PopReviveService.java	0.00%	2 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8652      +/-   ##
=============================================
+ Coverage      47.26%   50.75%   +3.48%     
- Complexity     11487    14571    +3084     
=============================================
  Files           1277     1344      +67     
  Lines          89432   109452   +20020     
  Branches       11502    16128    +4626     
=============================================
+ Hits           42272    55551   +13279     
- Misses         41953    47605    +5652     
- Partials        5207     6296    +1089     

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