327 Update Donors Page to match figma

[mehanana]

ℹ️ Issue

Closes #327

📝 Description

Updated the donors page & modal to match the figma design

Briefly list the changes made to the code:

1. Removed unecessary buttoms (sort by & filter by) and replaced with the "last donated" button
2. Changed a column in the table to be contact name; also made the names fit within the column and not change the size of column if it was too long
3. Added the email icon to the donors modal & made the "add donor" button disabled if the sections in the form weren't filled out

✔️ Verification

What steps did you take to verify your changes work? These should be clear enough for someone to be able to clone the branch and follow the steps themselves.

Provide screenshots of any new components, styling changes, or pages.
Overflow names:

Sorted by most recent:

Sorted by least recent:

Grayed out button when sections not filled in (and also email icon):

Button enabled when sections filled out:

Add donor button worked (test org donor added):

All Donors jest tests work:

🏕️ (Optional) Future Work / Notes

Did you notice anything ugly during the course of this ticket? Any bugs, design challenges, or unexpected behavior? Write it down so we can clean it up in a future ticket!
I believe the mock data was replaced in another ticket so I didn't touch that functionality, so we may run into merge conflicts when merging this and the other ticket into main.

[nourshoreibah]

looks great!