[CAL-757] UI Dropdown menu's are inconsistent all over the app

It's all detailed in Figma: 

[   ↳ Dropdown menu - Cal - Live (Figma)](https://www.figma.com/file/xk4HOxtSI82J0F7enMxeak/Cal---Live?node-id=1359%3A151225&t=3hNynQ6hBKZ73ols-1)

<sub>From [SyncLinear.com](https://synclinear.com) | [CAL-757](https://linear.app/calcom/issue/CAL-757/ui-dropdown-menus-are-inconsistent-all-over-the-app)</sub>