DateTimePicker: Can now select time correctly

[eledobleefe]

What is this feature?
It allows the user to select time in the DateTimePicker.

Why do we need this feature?
To be able to select a value on TimeOfDayPicker and keep it.

Who is this feature for?
Everyone

Which issue(s) does this PR fix?:
Fixes #65262

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.
• There are no known compatibility issues with older supported versions of Grafana, or plugins.
• It passes the Hosted Grafana feature readiness review for observability, scalability, performance, and security.

[grafanabot]

Hello @eledobleefe!
Backport pull requests need to be either:

• Pull requests which address bugs,
• Urgent fixes which need product approval, in order to get merged,
• Docs changes.

Please, if the current pull request addresses a bug fix, label it with the type/bug label.
If it already has the product approval, please add the product-approved label. For docs changes, please add the type/docs label.
If none of the above applies, please consider removing the backport label and target the next major/minor release.
Thanks!

[ashharrison90]

good mob 🔱

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