Improve date handling on frontend

[bcho892]

The problem before is the different timezones on the frontend return different dates from the date inputs. The fix here is to use getDay on the front end (to display the appropriate data to the user) and backend but on the back end need to re-parse the date to its timezone to account for differences.

• Switch to getDay instead of getUTCDay (helps to resolve the issue of dates getting "pushed back" one day)
• Add check on frontend to disallow selection of 10 > nights
• Display the dates the current booking is for in the checkout session

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit ec380ae):

https://uasc-ceebc--pr446-445-frontend-normali-ohkqydee.web.app

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