[ISSUE #8736] fix searchOffset corner case in rocksdb consume queue

[yuz10]

Which Issue(s) This PR Fixes

Fixes #8736

treat the corner case, following the code：
https://github.com/apache/rocketmq/blob/develop/store/src/main/java/org/apache/rocketmq/store/ConsumeQueue.java#L240

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 47.38%. Comparing base (525f877) to head (ad3431c).

Files with missing lines	Patch %	Lines
...rocketmq/store/queue/RocksDBConsumeQueueTable.java	62.50%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8737      +/-   ##
=============================================
- Coverage      47.48%   47.38%   -0.10%     
+ Complexity     11568    11559       -9     
=============================================
  Files           1282     1282              
  Lines          89813    89829      +16     
  Branches       11553    11559       +6     
=============================================
- Hits           42646    42565      -81     
- Misses         41935    42006      +71     
- Partials        5232     5258      +26     

Flag	Coverage Δ
	47.38% <62.50%> (-0.10%)	⬇️

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