[native] Drawer labels styling

Summary:
Linear issues: https://linear.app/comm/issue/ENG-2397/community-drawer-colours
https://linear.app/comm/issue/ENG-2343/style-the-navigation-drawer-on-native
https://linear.app/comm/issue/DES-10/design-for-light-mode-on-native

Designs: https://www.figma.com/file/WmS4u84vnveHHCcZusn5A4/%E2%9A%A1%EF%B8%8F-Mobile-App-Sidedrawer?node-id=4429%3A32903&t=tqg2p8kNEmavnWil-0
https://www.figma.com/file/L675ETKDnGaSwlpZAw4MIC/Mobile-App?node-id=3598%3A52104&t=SscXfXRNOzPWSkDp-0

Drawer item labels on different levels have different styling. This diff addresses that.

Test Plan: Test on simulator and physical device that all looks fine. Checked with inspector that the values are right.

Reviewers: ginsu, bartek, tomek

Reviewed By: bartek, tomek

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D5867