fix(datetime): do not animate to new value when multiple values set

[liamdebeasi]

Issue number: resolves #28602

---

What is the current behavior?

We animate to the new date when the value is changed, but we do not account for multiple selection. This behavior is valuable for when the value is set asynchronously on a different month than what it shown.

However, this is confusing when there are multiple dates selected because we do not reasonably know which date to animate to.

What is the new behavior?

• Datetime no longer animates to the new value if more than 1 date is selected

Does this introduce a breaking change?

• Yes
• No

Other information

Dev build: 7.5.8-dev.11701293337.112ba209

Steps to test:

1. Open https://codepen.io/liamdebeasi/pen/jOdvQzg in a StackBlitz.
2. Scroll to a different month and select a date. Observe that the datetime scrolls back to the initial month.
3. Open https://codepen.io/liamdebeasi/pen/XWOPyqj (same code sample, just with dev build installed)
4. Repeat step 2. Observe that the datetime does not scroll back to the initial month.
5. Using dev tools, set the value of the datetime to ['2023-01-01'] and observe that the datetime scrolls to that date.

[liamdebeasi]

This fix is incomplete. The team will refine next week, and someone will work on a proper fix.