feat: bring back removed deprecated packages react-alert,react-infobutton,react-virtualizer and add React 19 support

.github/CODEOWNERS

@@ -333,6 +333,11 @@ packages/react-components/react-menu-grid-preview/library @microsoft/teams-prg
 packages/react-components/react-menu-grid-preview/stories @microsoft/teams-prg
 # <%= NX-CODEOWNER-PLACEHOLDER %>
 
+# Deprecated v9 packages - exposed as part of `/unstable` api
+packages/react-components/deprecated/react-alert @microsoft/cxe-prg
+packages/react-components/deprecated/react-virtualizer @microsoft/cxe-prg
+packages/react-components/deprecated/react-infobutton @microsoft/cxe-prg
+
 ## Components
 packages/react @microsoft/cxe-red
 packages/react/src/components/ActivityItem @microsoft/cxe-red @khmakoto

apps/public-docsite-v9/project.json

@@ -8,7 +8,14 @@
     "build-storybook": {
       "dependsOn": [
         {
-          "projects": ["react-storybook-addon", "react-storybook-addon-export-to-sandbox", "storybook-llms-extractor"],
+          "projects": [
+            "react-storybook-addon",
+            "react-storybook-addon-export-to-sandbox",
+            "storybook-llms-extractor",
+            "react-alert",
+            "react-infobutton",
+            "react-virtualizer"
+          ],
           "target": "build"
         }
       ]

change/@fluentui-react-alert-c1a48194-b9d2-41de-a10f-9341dc304466.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "feat: add react 19 support",
+  "packageName": "@fluentui/react-alert",
+  "email": "martinhochel@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/@fluentui-react-infobutton-f9de17d9-6af3-4b65-a1e4-1e4506547478.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "feat: add react 19 support",
+  "packageName": "@fluentui/react-infobutton",
+  "email": "martinhochel@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/@fluentui-react-virtualizer-00170613-d8c6-4f01-93f0-e5eb2cb7e017.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "feat: add react 19 support",
+  "packageName": "@fluentui/react-virtualizer",
+  "email": "martinhochel@microsoft.com",
+  "dependentChangeType": "patch"
+}

packages/react-components/deprecated/react-alert/.babelrc.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../../../../.babelrc-v9.json",
+  "plugins": ["annotate-pure-calls", "@babel/transform-react-pure-annotations"]
+}

packages/react-components/deprecated/react-alert/.eslintrc.json

@@ -0,0 +1,4 @@
+{
+  "extends": ["plugin:@fluentui/eslint-plugin/react"],
+  "root": true
+}

packages/react-components/deprecated/react-alert/.swcrc

@@ -0,0 +1,30 @@
+{
+  "$schema": "https://json.schemastore.org/swcrc",
+  "exclude": [
+    "/testing",
+    "/**/*.cy.ts",
+    "/**/*.cy.tsx",
+    "/**/*.spec.ts",
+    "/**/*.spec.tsx",
+    "/**/*.test.ts",
+    "/**/*.test.tsx"
+  ],
+  "jsc": {
+    "parser": {
+      "syntax": "typescript",
+      "tsx": true,
+      "decorators": false,
+      "dynamicImport": false
+    },
+    "externalHelpers": true,
+    "transform": {
+      "react": {
+        "runtime": "classic",
+        "useSpread": true
+      }
+    },
+    "target": "es2019"
+  },
+  "minify": false,
+  "sourceMaps": true
+}