Fix dev after app creation with App Management API

[gonzaloriestra]

WHY are these changes introduced?

The CLI was using the wrong API client after creating an app in a Business Platform organization.

WHAT is this pull request doing?

Select the developer platform client from the configuration instead of using the default one.

How to test your changes?

• p shopify app init
• USE_APP_MANAGEMENT_API=1 p shopify app dev => create a new app

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	73.01% (+0.01% 🔼)	8390/11491
🟡	Branches	69.58% (+0.02% 🔼)	4092/5881
🟡	Functions	71.75%	2179/3037
🟡	Lines	73.36% (+0.01% 🔼)	7939/10822

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / info.ts	90.09% (-0.09% 🔻)	75%	93.33%	92.16% (-0.08% 🔻)

Test suite run success

1889 tests passing in 857 suites.

Report generated by 🧪jest coverage report action from b0cbaf5

[github-actions]

We detected some changes at either packages/*/src or packages/cli-kit/assets/cli-ruby/** and there are no updates in the .changeset.
If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.