1283 date range selector should display the date range for the past week by default

[nichhk]

Fixes #1283

The DatePicker was not showing the default date range of the past week since it was relying on local state to render the date range, instead of relying on the date range in the Redux store. This PR gets rid of local date state in most of our date-related components, and makes the DatePicker use the dates from the Redux store.

Now we can see that the default of 1 week is shown in the date range when the user opens the app:

• Up to date with dev branch
• Branch name follows guidelines
• All PR Status checks are successful
• Peer reviewed and approved

Any questions? See the getting started guide

[nichhk]

Thanks Shannan!