Reland "[ios] Fix multi-color key icon asset for passwords on bling."

This is a reland of commit 0ceeb0c426b8fb44e2a92338ab490712dd5b29d7

Adding fix to ignore the new asset for the target environment catalyst.

Original change's description:
> [ios] Fix multi-color key icon asset for passwords on bling.
>
> This CL fixes the multi-color icon to support the monochrome usage of
> it.
>
> Also uses the new icon in omnibox. And controls this change with
> kIOSShowPasswordStorageInSaveInfobar.
>
> Screenshot available here: https://crbug.com/1392708#c26
>
> Bug: 1392708
> Change-Id: I4b734e1189b6a4804683edb83dde9f81b95b5a84
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4188957
> Commit-Queue: Jood Hajeer <jood@google.com>
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1096698}

Bug: 1392708
Change-Id: Ib49b62c3d6b156f4772b7205e813592810658973
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4194774
Commit-Queue: Jood Hajeer <jood@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1098772}