fix(datetime): days keep in focus after changing the month (#31021)

Issue number: internal

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## What is the current behavior?
In Android native, when a user places a day in focus and then changes
the month by dragging the month, the div previous on focus remains in
focus in the new month.

## What is the new behavior?
After changing the month, the focus is removed from the active element
and placed on the calendar


## Does this introduce a breaking change?

- [ ] Yes
- [ ] No


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

---------

Co-authored-by: Shane <shane@shanessite.net>

Author: os-davidlourenco

core/src/components/datetime/datetime.tsx

@@ -1033,6 +1033,11 @@ export class Datetime implements ComponentInterface {
           if (this.resolveForceDateScrolling) {
             this.resolveForceDateScrolling();
           }
+
+          const activeEl = this.el.shadowRoot!.activeElement as HTMLElement | null;
+          if (activeEl && activeEl.classList.contains('calendar-day')) {
+            (activeEl.closest('.calendar-body') as HTMLElement | null)?.focus();
+          }
         });
       };