extension targeting preloads

[cpeddecord]

WHY are these changes introduced?

closes https://github.com/Shopify/checkout-web/issues/39215

addresses part of https://github.com/Shopify/shopify/issues/545531 which implements extension.targeting.preloads as defined in this PR.

We need to introduce a preloading concept for UI extensions to statically define URLs preloads ahead of time for security and performance.

[[extensions.targeting]]
target = "purchase.checkout.chat.render"

[extensions.targeting.preloads]
chat = "/url"

WHAT is this pull request doing?

adding needed schemas to support the above static configurations for UI extensions.

How to test your changes?

pnpm run deploy should insert the records correctly.

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[github-actions]

Thanks for your contribution!

Depending on what you are working on, you may want to request a review from a Shopify team:

• Themes: @shopify/advanced-edits
• UI extensions: @shopify/ui-extensions-cli
  • Checkout UI extensions: @shopify/checkout-ui-extensions-api-stewardship
• Hydrogen: @shopify/hydrogen
• Other: @shopify/app-inner-loop

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.53% (+0.01% 🔼)	8404/11587
🟡	Branches	69.03% (+0.03% 🔼)	4120/5968
🟡	Functions	71.98%	2199/3055
🟡	Lines	72.8% (+0.01% 🔼)	7948/10917

Test suite run success

1918 tests passing in 871 suites.

Report generated by 🧪jest coverage report action from 851867c

[rcaplanshopify]

Code LGTM!

[jffortier]

Small things in the test, otherwise all good!

[isaacroldan]

you need to run pnpm changeset add from the root, if you run it inside packages/app it won't work and adds a few extra files. (You'd need to delete packages/app/.changeset)