Convert FormBuilder.js to module

[ViolanteCodes]

Converts FormBuilder.js to module that is then imported by the necessary templates, in preparation for splitting the file later. Removes the now unnecessary helper class from the FE test runner.

[Copilot]

⚠️ Not ready to approve

The template currently uses deferred module scripts to define FormBuilder but then references it from a classic script that executes before the module runs, causing a runtime FormBuilder is undefined error.

Pull request overview

This PR converts the Form Builder frontend script into an ES module so it can be imported directly (including by Vitest), removing the previous “evaluate source to extract class” helper.

Changes:

• Export FormBuilder from form-builder.js as an ES module.
• Update Vitest tests to import FormBuilder directly and delete the old loader helper.
• Update the admin template to load form-builder.js as a module (but the current script ordering introduces a runtime error; see comment).

File summaries

File	Description
tests_js/form-builder/setupCanvas.test.js	Switches tests from helper-based class loading to direct ES module import.
tests_js/form-builder/initializePropertyFormTabs.test.js	Switches tests from helper-based class loading to direct ES module import.
tests_js/form-builder/addFieldAtPosition.test.js	Switches tests from helper-based class loading to direct ES module import.
tests_js/form-builder/helpers/loadFormBuilderClass.js	Removes the no-longer-needed helper that evaluated the source to extract the class.
django_forms_workflows/templates/admin/django_forms_workflows/form_builder.html	Updates script tags to load the Form Builder JS as a module (currently with a timing/ordering issue).
django_forms_workflows/static/django_forms_workflows/js/form-builder.js	Exports FormBuilder as a named ES module export.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 1
• Review effort level: Low

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