[FEATURE] Support rendering inline errors in `MethodCard`

Feature request summary

Currently duplicate title errors can only be rendered in a banner, as MethodCard has no inline error rendering capability - a potential solution would be to add an errors prop to the component.

Rationale

Without this feature, apps are unable to follow the app design alert guidelines.

Also

Where is the best place to report bugs? The discountAutomaticAppUpdate mutation currently returns doubles of the title must be unique error :D

{
    "data": {
        "discountAutomaticAppUpdate": {
            "userErrors": [
                {
                    "field": [
                        "automaticAppDiscount",
                        "title"
                    ],
                    "message": "must be unique",
                    "__typename": "DiscountUserError"
                },
                {
                    "field": [
                        "automaticAppDiscount",
                        "title"
                    ],
                    "message": "must be unique",
                    "__typename": "DiscountUserError"
                }
            ],
            "__typename": "DiscountAutomaticAppUpdatePayload"
        }
    },
   ...
}

Start by locating the MethodCard component and reviewing how it currently renders banner errors. Trace the existing error data flow, including the proposed errors prop, and check the component's tests if present. Done means duplicate title errors can be rendered inline in MethodCard in a way that supports Shopify's inline error guidance.