fix(pds-dropdown-menu-item): add reflect option to target and external props

[QuintonJason]

Description

Fixes the target and external props on pds-dropdown-menu-item not working when set via HTML attributes.

The target and external props were added in v3.15.0 but weren't being reflected from HTML attributes to component properties. This prevented them from being passed to the nested pds-link component, making it impossible for links in dropdown menus to open in new tabs.

Root Cause

Stencil requires the reflect: true option on @Prop() decorators to sync HTML attributes with component properties. Without this option, setting an attribute like target="_blank" would add the HTML attribute but not update the component property.

Solution

Added reflect: true to both prop decorators in pds-dropdown-menu-item.tsx to ensure proper attribute-to-property synchronization.

Fixes DSS-116

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• unit tests - All existing tests pass, including pds-dropdown-menu-item.spec.tsx
• e2e tests
• accessibility tests
• tested manually - Verified target="_blank" opens links in new tabs and external adds icon
• other:

Test Configuration:

• Pine versions: 3.15.1
• OS: macOS
• Browsers: Chrome, Safari
• Screen readers: N/A
• Misc: Built successfully with no errors

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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