refactor the DateTimeParameterEditor to be a functional component

[sixlighthouses]

What this PR does

Fixes #6896

This is a description of what I've done in this PR, especially explaining choices made to make the reviewer's job easier. If I don't replace this paragraph with an actual description, my PR will probably be ignored.

Test me

Browse to
http://ci.terria.io/wps-time-reset/#share=s-bRTdoGD1E1hSA95nLCVwIEjNXa9

From the My Data tab select the AWAVEA WPS service and then the Wave: Annual Bivariate Probability Distribution service

Select a point location, manually edit the start and end times. Update the times manually several times to test that the other unedited values do not change.

Ensure the debugging console is open on the Network tab, hit Run Analysis

confirm the Payload of the request has the Date Time correctly formatted as YYYY-MM-DDThh:mm

Checklist

• There are unit tests to verify my changes are correct
• I've updated CHANGES.md with what I changed.
• I've provided instructions in the PR description on how to test this PR.

[sixlighthouses]

@nf-s please hold off on reviewing this PR -- I think this one #7026 once out of draft will cover both #6895 and #6896