Update QA scripts to support global CLI

[isaacroldan]

WHY are these changes introduced?

As part of the release QA process we want to test that a global installation of the CLI works as expected.

WHAT is this pull request doing?

• Add a new flag to the app QA script to install the CLI globally.
• Install and run the global CLI when required.
• Don't install @shopify/theme anymore

How to test your changes?

Run different combinations of node bin/create-test-app.js (with --global, -i nightly, -i experimental, ...)

Post-release steps

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
• [ ] I've made sure that any changes to dev or deploy have been reflected in the internal flowchart.

[github-actions[bot]]

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-management

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	72.05%	7019/9742
🟡	Branches	68.94%	3469/5032
🟡	Functions	71.49%	1881/2631
🟡	Lines	73.37%	6616/9017

Test suite run success

1649 tests passing in 766 suites.

Report generated by 🧪jest coverage report action from 40689c9ba6853f19f9a17d762b5412ee9268a323