[iOS] Remove SymbolView

Instead of using the Symbol view, directly add the symbol on a colorful
background with corner radius.
Also updates the TableViewInfoButton and TableViewDetailIconCell cells
to have an interface taking the new property into account.

Remove the SymbolView and container.

The colours of the Settings Symbols are also updated to reflect the
requirements which changed.

Bug: 1315544
Change-Id: I719ff45c3d36aed0b0a7aee19b7fb8e7bdbe1778
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3876983


Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1044508}