fix(fuselage): ensure TextAreaInput matches global disabled styling

[Kalpana-chavhan]

Description:

This PR updates the InputBox SCSS styles to ensure that textarea elements correctly inherit the disabled background color and cursor styles. It also adds unit tests to verify prop propagation.

Changes:

Updated InputBox.scss to apply $input-colors-disabled-background-color to textarea types.

Added cursor: not-allowed to the disabled state block.

Updated TextAreaInput.specs.tsx with new test cases for disabled and readOnly attributes.

closes #1817

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Latest commit: a3d63c6

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[Kalpana-chavhan]

Hi Maintainers,
Just a gentle follow-up on this PR.
All checks are passing, please let me know if any changes are needed from my side.
Thanks! @KevLehman , @tassoevan , @ricardogarim , @dougfabris