[UX fixes] Text alignment: https://hsv.googleplex.com/5891097690636288

No useless manage sign-ins title: https://hsv.googleplex.com/6199286827057152
Button color fix: https://hsv.googleplex.com/6672594588663808

Convert margins from dp to percentage and increase max lines to 2:
Screens with Percentages Margins + other Teamfood UI bug fixes :
Sign in options page: https://hsv.googleplex.com/4613594028179456, https://hsv.googleplex.com/5418564180770816
Choose a sign in: https://hsv.googleplex.com/4982413338869760
Single passkey screen: https://hsv.googleplex.com/5974787426877440

After maxLines set to 2 and alignment in chips fixed: https://hsv.googleplex.com/5014505334505472

Flag: EXEMPT bugfix
Bug: 355236535, 355246297, 356047923, 337068075, 356048574
Test: Manual observation
Change-Id: I6bafdd679a9fe9a73019280b5af14c92d9ec740b