fix(pds-tab): add add disabled prop

[QuintonJason]

Description

Adds a disabled prop to the pds-tab component, allowing individual tabs to be disabled within a tablist.

Summary of changes:

• Added disabled prop to pds-tab component with default value of false
• Disabled tabs cannot be clicked or receive focus
• Added proper accessibility attributes (aria-disabled, disabled, tabindex="-1")
• Added disabled styling for all tab variants (primary, pill, availability, filter)
• Disabled tabs display with muted text color and cursor: not-allowed
• Added documentation example showing disabled tab usage

Motivation:
This feature enables consumers to disable specific tabs when certain content or functionality is unavailable, improving UX by clearly indicating non-interactive options while maintaining accessibility standards.

No new dependencies required.

Fixes DSS-64

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• unit tests
• e2e tests
• accessibility tests
• tested manually
• other:

Tests added:

• Unit test verifying disabled tab renders with correct attributes (aria-disabled, disabled, is-disabled class)
• Unit test verifying click events do not fire when tab is disabled

Test Configuration:

• Pine versions: 3.12.1
• OS: macOS
• Browsers: N/A (unit tests)
• Screen readers: N/A
• Misc: Stencil test runner

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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Files changed:

• libs/core/src/components/pds-tabs/pds-tab/pds-tab.tsx - Added disabled prop and logic
• libs/core/src/components/pds-tabs/pds-tab/pds-tab.scss - Added disabled styles for all variants
• libs/core/src/components/pds-tabs/pds-tab/test/pds-tab.spec.tsx - Added unit tests
• libs/core/src/components/pds-tabs/docs/pds-tabs.mdx - Added disabled example

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[pixelflips]

LGTM!

[AndrwM]

💯 ❤️ thank you!