fix: remove all deprecated @mui/ alert classes (#22233)

This pull-request removes all the magic of `@mui/material/Alert` 🥳 We're
officially free of any alerts that are being handled by Material UI so
this is dead code.

site/src/modules/resources/WildcardHostnameWarning.tsx

@@ -1,6 +1,5 @@
-import AlertTitle from "@mui/material/AlertTitle";
 import type { WorkspaceResource } from "api/typesGenerated";
-import { Alert, AlertDetail } from "components/Alert/Alert";
+import { Alert, AlertDetail, AlertTitle } from "components/Alert/Alert";
 import { Link } from "components/Link/Link";
 import { useProxy } from "contexts/ProxyContext";
 import { useAuthenticated } from "hooks/useAuthenticated";

site/src/theme/mui.ts

@@ -3,8 +3,6 @@
  * This file provides MUI theme overrides for legacy compatibility only.
  */
 
-/** @deprecated MUI Alert classes are deprecated. Use shadcn/ui Alert component instead. */
-import { alertClasses } from "@mui/material/Alert";
 /** @deprecated MUI ThemeOptions is deprecated. Migrate to Tailwind CSS theme system. */
 import type { ThemeOptions } from "@mui/material/styles";
 import {
@@ -284,47 +282,4 @@ export const components = {
 			}),
 		},
 	},
-	MuiAlert: {
-		defaultProps: {
-			variant: "outlined",
-		},
-		styleOverrides: {
-			root: ({ theme }) => ({
-				background: theme.palette.background.paper,
-			}),
-			action: {
-				paddingTop: 2, // Idk why it is not aligned as expected
-			},
-			icon: {
-				fontSize: 16,
-				marginTop: "4px", // The size of text is 24 so (24 - 16)/2 = 4
-			},
-			message: ({ theme }) => ({
-				color: theme.palette.text.primary,
-			}),
-			outlinedWarning: ({ theme }) => ({
-				[`& .${alertClasses.icon}`]: {
-					color: theme.palette.warning.light,
-				},
-			}),
-			outlinedInfo: ({ theme }) => ({
-				[`& .${alertClasses.icon}`]: {
-					color: theme.palette.primary.light,
-				},
-			}),
-			outlinedError: ({ theme }) => ({
-				[`& .${alertClasses.icon}`]: {
-					color: theme.palette.error.light,
-				},
-			}),
-		},
-	},
-	MuiAlertTitle: {
-		styleOverrides: {
-			root: {
-				fontSize: "inherit",
-				marginBottom: 0,
-			},
-		},
-	},
 } satisfies ThemeOptions["components"];

site/vite.config.mts

@@ -130,8 +130,6 @@ export default defineConfig({
 			"@emotion/react",
 			"@emotion/react/jsx-runtime",
 			"@emotion/styled",
-			"@mui/material/Alert",
-			"@mui/material/AlertTitle",
 			"@mui/material/Autocomplete",
 			"@mui/material/Card",
 			"@mui/material/CardActionArea",