18273 Add show-current to DatePicker

[leodube-aot]

Issue #: /bcgov/entity#18273

Description of changes:
I needed specific functionality to improve the DatePicker for #18273. Currently, when we add a min restriction on the DatePicker in the Agm Extension Request component, the min valid date can be several months, or even over a year into the future. When the picker loads, is does not default to the earliest valid date, and instead shows the current date.

Passing the minimum date to showCurrent will now display the earliest valid date by default when the component loads.

<DatePicker
  ...
  initialValue="2025-06-06"   // initialValue also needs to be provided for the title date button to update as well
  minDate="2025-06-06"
  showCurrent="2025-06-06"
  ...
/>

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the business-filings-ui license (Apache 2.0).

[ketaki-deodhar]

Looks good!

[JazzarKarim]

👍