Fix offsetTableKey validate error in broadcast

[1782935682]

Which Issue(s) This PR Fixes

Fixes #9603

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 37.50000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.03%. Comparing base (e4b731c) to head (67c0998).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../rocketmq/broker/offset/ConsumerOffsetManager.java	38.88%	8 Missing and 3 partials ⚠️
...etmq/broker/config/v2/ConsumerOffsetManagerV2.java	0.00%	1 Missing and 1 partial ⚠️
...cketmq/broker/offset/LmqConsumerOffsetManager.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9602      +/-   ##
=============================================
- Coverage      48.10%   48.03%   -0.08%     
+ Complexity     12063    12044      -19     
=============================================
  Files           1313     1313              
  Lines          92771    92789      +18     
  Branches       11862    11866       +4     
=============================================
- Hits           44629    44567      -62     
- Misses         42636    42695      +59     
- Partials        5506     5527      +21     

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