fix: Add accessible label to date time picker popper

Kavita Gautamrequested to merge
fix/add-accessible-label-date-time-picker-popper into main

This MR updates the DateTimePicker.tsx to add an accessible aria-label placing date-time-picker translation key.

This allows Playwright tests to target the DateTimePicker popper using a stable accessible locator.

Relates to: https://git.opentalk.dev/opentalk/qa/to-do/-/work_items/140

Edited by Kavita Gautam

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