Update and Fix Observation Filtering - MAGE-1501

[RyCarpenter]

This PR Fixes the Date Based Filtering for Observations, as well as adds two new Options {User, Form} to choose from.

Test Instructions:

Before Testing, you will need a server that has multiple observations, with multiple forms, and multiple users.

1. Log into Mage
2. On the Map Page Click the Filter Funnel Button in the upper left
3. Set Filter Options To Your Liking (Event, Teams, User, Forms, Time)
4. Click Filter
5. Expected result is that your Observations are Filtered in based on your selections.
6. Play around with different combinations, All combinations should work.
7. Change Events
8. All Filters should clear
9. Try to filter on the new event

[danbenner-vega]

Nice work

[paulsolt-ofsw]

Overall it looks good. I tested this locally and it worked.

1. I would separate style changes from the actual fix (if possible) so that it's easier to grok what the problem was.
2. I can't tell if it was in the html component or filter.component.ts or somewhere else with all the function style changes. Could you direct me to where I should look at code?
3. We do have a filter issue, that prevents Forms from loading after you press "Filter" on the filter screen. That's an existing bug, but related to the user experience of filtering (on Chrome/Safari).
4. I had one instance where it appears my observation didn't get saved, and so it was not working with the filter. I don't know if that's an existing bug or weird state from turning on/off several filters. We we're not able to replicate that situation on Safari again.