Datepicker doesn't let you update the year without updating date/time

[bhavyarm]

Current implementation of super date picker doesn't let the user update the year without updating the date and time.

[bhavyarm]

cc @cchaos Thanks!

[cchaos]

Basically, selecting a year doesn't change the date until you select an actual date on the calendar, so if you skip that step and select a year, then select a time, it reverts back to the original year. We need the date picker to change the date upon year selection.

[cchaos]

cc @snide @chandlerprall

[cchaos]

Confirmed that the same thing happens with month selection.

[Kolano]

Various aspects of the datepicker also seem to be broken in Firefox, refer #35022

[snide]

Reference for the above is elastic/kibana#35022