Switch to standardrb

[AlistairNorman]

Summary

This builds off of #6241

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• I agree that my PR will be published under the same license as Solidus.
• I have written a thorough PR description.
• I have kept my commits small and atomic.
• I have localized any and all user-facing strings that I added to the source code.
• I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[jarednorman]

This only fixes the issues that could be automatically fixed. There's still a handful of things that couldn't be automatically addressed.

[mamhoff]

I like this change, and I think it sets us up on a good track. Why not mark it as ready for review?

[jarednorman]

I just bugged @AlistairNorman to get this wrapped when he has time. Would love to see this put to bed once and for all.

[AlistairNorman]

I'll definitely work on it but there are 94 offences that can't be automatically corrected

[codecov]

Codecov Report

❌ Patch coverage is 94.58484% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.95%. Comparing base (997f46a) to head (5196741).

Files with missing lines	Patch %	Lines
...erators/solidus_admin/install/install_generator.rb	0.00%	4 Missing ⚠️
.../controllers/solidus_admin/addresses_controller.rb	57.14%	3 Missing ⚠️
...app/controllers/solidus_admin/orders_controller.rb	75.00%	2 Missing ⚠️
...omponents/solidus_admin/products/show/component.rb	0.00%	1 Missing ⚠️
...onents/solidus_admin/stock_items/edit/component.rb	0.00%	1 Missing ⚠️
...n/ui/forms/address/fieldsets/location/component.rb	0.00%	1 Missing ⚠️
...mponents/solidus_admin/ui/pages/index/component.rb	94.44%	1 Missing ⚠️
...lidus_admin/users/store_credits/index/component.rb	66.66%	1 Missing ⚠️
.../controllers/solidus_admin/customers_controller.rb	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6421      +/-   ##
==========================================
+ Coverage   89.51%   92.95%   +3.43%     
==========================================
  Files         981      479     -502     
  Lines       20504     8853   -11651     
==========================================
- Hits        18355     8229   -10126     
+ Misses       2149      624    -1525     

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[mamhoff]

I'll definitely work on it but there are 94 offences that can't be automatically corrected

Just put them into the ignore/to-do file for now. They can be corrected later!