feat: first start addding shipping_label attribute

[JannikZed]

Scope of the PR

Adding support for shipping_label in the attributes mapping.
Docs: https://support.google.com/merchants/answer/6324504?hl=en

Checklist

• I added changesets and read good practices.

[changeset-bot]

🦋 Changeset detected

Latest commit: 0bc3bc5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
products-feed	Minor

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[JannikZed]

this PR is tested with the merchant center and allows us to setup free shipping just for specific items.

[krzysztofzuraw]

@JannikZed can you fix errors from lint & test workflows 🙏🏻

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 20 lines in your changes missing coverage. Please review.

Project coverage is 44.06%. Comparing base (34da7f1) to head (0bc3bc5).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...s-feed/src/modules/google-feed/product-to-proxy.ts	20.00%	8 Missing ⚠️
...dules/app-configuration/attribute-mapping-form.tsx	0.00%	7 Missing ⚠️
apps/products-feed/src/pages/configuration.tsx	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1713      +/-   ##
==========================================
- Coverage   44.06%   44.06%   -0.01%     
==========================================
  Files         643      643              
  Lines      296028   296058      +30     
  Branches     1997     2000       +3     
==========================================
+ Hits       130434   130444      +10     
- Misses     165188   165208      +20     
  Partials      406      406              

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[JannikZed]

@krzysztofzuraw not sure, how the code coverage did decrease? Tests are in there.. so maybe you can take a look about that. All other checks pass.

[vercel]

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