wip fix: [AlertFieldLevel] margin 0.5em, icon vertical centering issue, TextInput changes, Checkbox changes

[shindigira]

closes #276

POSTPONED

Will require a preceding DS approval before a DSR approval.

TODO

• Change Margin between icon and text to 5px in AlertFieldLevel
• fix the vertically align icon in Alert (not fieldlevel) (Delay LOW PRIORITY: [context](figma comment that we will revisit this change later))
• vertically align Checkbox and label text, margin with text also
• Error dotted line around checkbox/textinput
• textinput/checkbox: red outline, get rid of hover blue, focus color should be same as border (e.g. error red)
  Dark hover colors: Text Input - Hover - Define state styling (Success/Warning/Error status) design-system#1881 (comment)

Changes

• Sets text to inline instead of block
• Vertically aligns the icon with the text
• Sets the margin between the icon and the text to be 8px (0.5em)

Screenshots

Before	After

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[billhimmelsbach]

Heyo @shindigira! Is this one ready for a review or is still WIP?

[billhimmelsbach]

Heyo @shindigira! I know you're still working on this, but just wanted to let you know that after today's discussions, these three TODOs are going to be fixed at the source in the DS first instead of in the DSR in this PR:

• Change Margin between icon and text to 5px in AlertFieldLevel
• fix the centering icon in Alert (not fieldlevel) (Delay LOW PRIORITY: [context](figma comment that we will revisit this change later))
• Error dotted line around checkbox/textinput

The first two of those TODOs (the margin and centering the icon) will also be de-prioritized and moved to the backlog for now too. Should make this PR a little smaller! 🤞