fix: prevent dropdown toggle on Enter in form input (Bootstrap #41354 workaround)

[sanchitkhthpalia]

Description

Added a JavaScript workaround to prevent Bootstrap dropdowns from toggling when pressing Enter in a form input. This ensures that pressing Enter in an input inside a form submits the form as expected, instead of toggling any dropdowns that appear after the input. The workaround is added to validate-forms.js as a temporary fix for #41354.

Motivation & Context

This change is required because, in Bootstrap 5.3.5, pressing Enter in a form input toggles dropdowns that appear after the input, instead of submitting the form. This is unexpected and breaks standard form behavior. The workaround restores the expected behavior until an upstream fix is released.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

N/A

Related issues

Fixes #41354