Use dedicated logger in rake tasks

[mamhoff]

Summary

This removes some of the uses of Rails.logger in rake tasks and generators and either allows the logger to be passed in as dependency injection, or - in a generator - uses Thor's say instead.

Checklist

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• I agree that my PR will be published under the same license as Solidus.
• I have written a thorough PR description.
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[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 8 lines in your changes missing coverage. Please review.

Project coverage is 88.97%. Comparing base (bbca5cc) to head (f15b78c).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
core/lib/spree/testing_support/common_rake.rb	0.00%	6 Missing ⚠️
...rs/solidus_promotions/install/install_generator.rb	0.00%	1 Missing ⚠️
...tions/lib/solidus_promotions/promotion_migrator.rb	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6272      +/-   ##
==========================================
+ Coverage   86.65%   88.97%   +2.31%     
==========================================
  Files         521      862     +341     
  Lines       11943    18424    +6481     
==========================================
+ Hits        10349    16392    +6043     
- Misses       1594     2032     +438     

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