Asset pipeline flow for hosted static app

[elanalynn]

DEPENDS ON https://github.com/shop/world/pull/382743 TO SHIP FIRST

WHY are these changes introduced?

Related to Hosted app project.

Related to https://github.com/shop/world/pull/382743

Closes https://github.com/shop/issues-admin-extensibility/issues/2186

WHAT is this pull request doing?

This PR introduces the asset pipeline flow for hosted static apps, enabling static asset copying during the build process.

• New hosted_app specification (app_config_hosted_app_home.ts): Adds a configuration extension specification for hosted apps with a static_root field
• New static_app build mode: Extends the build config modes to include static_app, which triggers static asset copying
• Enhanced config extension specifications:
  • Added optional buildConfig and copyStaticAssets parameters to createConfigExtensionSpecification()
  • Config extensions can now define custom build behavior

How it works

When a hosted app defines a static_root in its configuration:

1. The hosted_app specification is loaded with build mode static_app
2. During build, copyStaticAssets() is invoked
3. Contents from the configured static_root directory are copied to the output directory

How to test your changes?

• Configure a hosted app with static_root pointing to a static assets directory
• Run shopify app deploy and verify assets are copied to the output directory - .shopify/deploy-bundle
• Verify deploy works when static_root is not specified
• TODO: Verify appropriate error handling when source directory doesn't exist

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]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	79.47% (+0.25% 🔼)	14352/18059
🟡	Branches	73.7% (+0.59% 🔼)	7086/9615
🟡	Functions	79.61% (+0.24% 🔼)	3666/4605
🟡	Lines	79.84% (+0.25% 🔼)	13569/16996

Show new covered files 🐣

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🟢	... / admin-as-app.ts	100%	100%	100%	100%
🟢	... / metafield_definitions.ts	100%	100%	100%	100%
🟢	... / metaobject_definitions.ts	100%	100%	100%	100%
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🟢	... / fetch_store_by_domain.ts	100%	100%	100%	100%
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🔴	... / pull.ts	0%	100%	0%	0%
🔴	... / app_config_hosted_app_home.ts	40%	0%	0%	44.44%
🟡	... / execute-operation.ts	75%	50%	100%	75%
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🟢	... / common.ts	97.62%	95%	100%	97.06%
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🔴	... / promiseWithResolvers.ts	33.33%	50%	50%	33.33%

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St.❔	File	Statements	Branches	Functions	Lines
🔴	... / execute.ts	0%	0% (-100% 🔻)	0%	0%
🟢	... / loader.ts	94.06% (+0.2% 🔼)	86.41% (-0.42% 🔻)	97.17% (+0.11% 🔼)	94.85% (+0.18% 🔼)
🟢	... / extension-instance.ts	83.98% (-0.6% 🔻)	76.98% (-1.53% 🔻)	92.06% (+0.13% 🔼)	84.21% (-0.65% 🔻)
🟡	... / specification.ts	69.64% (+0.55% 🔼)	76.74% (+3.57% 🔼)	76.47% (-1.31% 🔻)	69.39% (+0.64% 🔼)
🟢	... / ui_extension.ts	87.9% (-6.93% 🔻)	77.19% (-4.06% 🔻)	85.19% (-14.81% 🔻)	90.07% (-6.39% 🔻)
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🟢	... / Logs.tsx	90%	90.91% (-5.97% 🔻)	100%	90%
🟢	... / fetch.ts	84.21% (+0.88% 🔼)	82.35% (-0.98% 🔻)	75%	85.29% (+1.42% 🔼)
🟢	... / app-event-watcher-handler.ts	86.36% (-4.11% 🔻)	75%	86.67%	85.71% (-5.19% 🔻)
🔴	... / server.ts	1.23% (-0.02% 🔻)	0%	0%	1.3% (-0.02% 🔻)
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🟢	... / api.ts	87.07% (-0.43% 🔻)	76.71% (-0.1% 🔻)	100%	86.49% (-0.43% 🔻)
🟢	... / device-authorization.ts	88.24% (-0.83% 🔻)	76.47% (-2.94% 🔻)	100%	88.24% (-0.83% 🔻)
🟢	... / SingleTask.tsx	84.21% (-15.79% 🔻)	50% (-50% 🔻)	80% (-20% 🔻)	84.21% (-15.79% 🔻)
🔴	... / environment.ts	35% (-5% 🔻)	41.18%	40% (-10% 🔻)	36.84% (-5.26% 🔻)
🔴	... / ui.tsx	50.82% (-0.79% 🔻)	42.86% (-5.53% 🔻)	54.55% (+1.42% 🔼)	50% (-0.82% 🔻)
🟢	... / console.ts	81.82% (+15.15% 🔼)	75% (-25% 🔻)	100% (+33.33% 🔼)	81.82% (+15.15% 🔼)
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Test suite run success

3670 tests passing in 1430 suites.

Report generated by 🧪jest coverage report action from e165a9d