Fixes a bug in the getHydrationFor7Days function

[butlertree]

Description

Fixed a bug in the getHydrationFor7Days to take an end date and return that day and the previous 6 for the week. Updated the test as well.

Contributors

@butlertree

Checklist

• [x] My PR has an appropriately descriptive and concise title.
• [x] My PR denotes any/all team members who contributed to it.
• [x] My code follows the Turing Style Guides and best practices.
• [x] I ran the code locally and verified that there are no visible errors.
• [x] feat: My PR clearly describes what feature I'm adding and any changes needed to make it work. (if applicable)
• [x] fix: My PR clearly describes what bug I'm fixing and why. (if applicable)

[butlertree]

I put the wrong ticket by mistake. The ticket should be for calculating the hydration for the past seven days. I can't see how to delete the wrong ticket.