If a non-map value is set for the `typography`, we were only setting the plain font family while the brand one was falling back to Roboto.

Fixes #31254.

(cherry picked from commit 8b821cb)

…31270)

Fixes that the v20 update migration was overwriting all files, even if they didn't change.

Fixes #31259.

(cherry picked from commit 7b47e95)

Fixes that the variants that wasn't rendering, because there was no extra new line between it and the preceding paragraph.

Fixes #31262.

(cherry picked from commit 01ec1e0)

…#31277)

Fixes that the v20 `ng update` migration was only replacing the first instance of tokens.

Fixes #31276.

(cherry picked from commit eba4719)