Add ProductVariantPrice custom fields ui inputs

[Draykee]

Description

• Added the custom field component to the ProductVariantPrice UI
• Introduced CreateProductVariantPriceInput type as well, for possible future UI updates
  Closes: Expose admin-ui for custom fields on ProductVariantPrice. #3020

Breaking changes

The admin-api schema needs to be updated. The Typescript should not break though, so it should be safe to update.

Screenshots

You can add screenshots here if applicable.

Checklist

📌 Always:

• I have set a clear title
• My PR is small and contains a single feature
• I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

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[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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12 out of 13 committers have signed the CLA.
✅ (oidt)[https://github.com/oidt]
✅ (michaelbromley)[https://github.com/michaelbromley]
✅ (Anddrrew)[https://github.com/Anddrrew]
✅ (mschipperheyn)[https://github.com/mschipperheyn]
✅ (twlite)[https://github.com/twlite]
✅ (jezzzm)[https://github.com/jezzzm]
✅ (xtul9)[https://github.com/xtul9]
✅ (jacobfrantz1)[https://github.com/jacobfrantz1]
✅ (Winne4r)[https://github.com/Winne4r]
✅ (HerclasNido)[https://github.com/HerclasNido]
✅ (dlhck)[https://github.com/dlhck]
✅ (Draykee)[https://github.com/Draykee]
❌ @kevin
Kevin seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[Draykee]

TODO: Improve the card and blend it into the current design

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
2.4% Duplication on New Code

See analysis details on SonarQube Cloud

[michaelbromley]

Hi Kevin!

Let's get this one merged. You'll just need to:

1. resolve the merge conflicts
2. regenerate the gql types but without the custom fields

I don't know why the CLA bot is unhappy but you definitely signed it so that won't be a blocker.

[dfernandesbsolus]

Hi @Draykee, thanks for you work, i need this feature, can i fix your pull request? :D

[Draykee]

I just can't get it working, because of husky. Crazy how simple git merges always turn out to be the most troublesome.

[Draykee]

I just can't get it working, because of husky. Crazy how simple git merges always turn out to be the most troublesome.

Ups.. @michaelbromley I think I made it worse 😅

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.0% Duplication on New Code

See analysis details on SonarQube Cloud