[I] [Enhancement] remove unused boolean flag [rocketmq]

[via GitHub]

miles-ton opened a new issue, #8150:
URL: https://github.com/apache/rocketmq/issues/8150

   ### Before Creating the Enhancement Request
   
   - [X] I have confirmed that this should be classified as an enhancement 
rather than a bug/feature.
   
   
   ### Summary
   
   In ProcessQueue class, we get a `consuming` boolean flag, but it is just 
used to get and set in class inner, and don't have any meaningful function.
   
   
![image](https://github.com/apache/rocketmq/assets/77013030/cede24e9-4cb7-4f3a-933e-ba8dd282dbe4)
   
![image](https://github.com/apache/rocketmq/assets/77013030/e41194b8-0629-4d18-9aec-984a15c23718)
   
![image](https://github.com/apache/rocketmq/assets/77013030/767b7b8c-0f99-41a2-9514-654ab246dc2e)
   
![image](https://github.com/apache/rocketmq/assets/77013030/6a1a892b-c698-457b-b3b6-dfa17d695033)
   
   
   ### Motivation
   
   simplify code
   
   ### Describe the Solution You'd Like
   
   remove that `consuming`
   
   ### Describe Alternatives You've Considered
   
   none
   
   ### Additional Context
   
   _No response_


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