[ISSUE #8150] Remove consuming boolean flag in ProcessQueue class

[miles-ton]

Which Issue(s) This PR Fixes

Fixes #8150

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 42.89%. Comparing base (2fdafd2) to head (e211635).

Files	Patch %	Lines
...he/rocketmq/client/impl/consumer/ProcessQueue.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8151      +/-   ##
=============================================
- Coverage      42.95%   42.89%   -0.07%     
+ Complexity     10384    10365      -19     
=============================================
  Files           1270     1270              
  Lines          88690    88686       -4     
  Branches       11401    11400       -1     
=============================================
- Hits           38097    38038      -59     
- Misses         45899    45945      +46     
- Partials        4694     4703       +9     

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[drpmma]

The consuming flag is actually used inside ProcessQueue class which is not consistent with your description.