Fix #6223 - ♿ Accessibility improvements: Month and Year dropdowns

[balajis-qb]

Description

Linked issue: Hacker0x01#6223

Problem
As mentioned in the attached ticket, the month select dropdown (showMonthDropdown) and the year select drop down (showYearDropdown) lacks ARIA attributes.

Changes

• Added the corresponding aria attributes to the select and the button element to support the dropdown mode (dropdownMode) of scroll and select
• Added test cases to validate the change

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

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