Fix shutdown logic in persistent queue to not require consumers to be closed first

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (6f65b63) 90.86% compared to head (015c11c) 90.86%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...rter/exporterhelper/internal/persistent_storage.go	65.21%	4 Missing and 4 partials ⚠️
exporter/exporterhelper/internal/mock_storage.go	71.42%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8899   +/-   ##
=======================================
  Coverage   90.86%   90.86%           
=======================================
  Files         317      317           
  Lines       17193    17204   +11     
=======================================
+ Hits        15623    15633   +10     
+ Misses       1280     1279    -1     
- Partials      290      292    +2     

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