fix(proxy): add PROPERTY_PRODUCER_GROUP property for transaction message

[ShadowySpirits]

No description provided.

[codecov]

Codecov Report

Merging #803 (b58dc26) into main (3afab4f) will decrease coverage by 0.06%.
The diff coverage is 11.11%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #803      +/-   ##
============================================
- Coverage     55.90%   55.85%   -0.06%     
+ Complexity     1231     1229       -2     
============================================
  Files           132      132              
  Lines          8366     8374       +8     
  Branches        769      772       +3     
============================================
  Hits           4677     4677              
- Misses         3285     3290       +5     
- Partials        404      407       +3     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	55.13% <ø> (ø)
RocketMQ Proxy	38.42% <11.11%> (-0.23%)	⬇️
RocketMQ Store	74.34% <ø> (+0.04%)	⬆️
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

Files	Coverage Δ
...omq/rocketmq/proxy/service/MessageServiceImpl.java	55.11% <0.00%> (-0.82%)	⬇️
...om/automq/rocketmq/proxy/util/FlatMessageUtil.java	51.49% <20.00%> (-1.23%)	⬇️

... and 1 file with indirect coverage changes