Use ctx in BucketMigrator

[kirugan]

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (d3b73d1) 72.75% compared to head (25eb2b1) 72.77%.

Files	Patch %	Lines
migration/bucket_migrator.go	25.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1521      +/-   ##
==========================================
+ Coverage   72.75%   72.77%   +0.02%     
==========================================
  Files          96       96              
  Lines        9982     9985       +3     
==========================================
+ Hits         7262     7267       +5     
  Misses       2176     2176              
+ Partials      544      542       -2     

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