Breaking change: Rename Stage to Volume

[lentitude2tk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (2.6@a016cff). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pymilvus/bulk_writer/volume_file_manager.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             2.6    #3091   +/-   ##
======================================
  Coverage       ?   45.30%           
======================================
  Files          ?       65           
  Lines          ?    13868           
  Branches       ?        0           
======================================
  Hits           ?     6283           
  Misses         ?     7585           
  Partials       ?        0           

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[XuanYang-cn]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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