Removing deprecated experimental components (#16961)

#### Pull request checklist

- [ ] Addresses an existing issue: Fixes #0000
- [x] Include a change request file using `$ yarn change`

#### Description of changes

This PR does a couple of things:
- Removes the previous experimental implementation of `Card` since it was never officially supported and it's not being worked on, and moves the WIP converged one from the `next` folder to be the default export in the `@fluentui/react-cards` package.
- Removes the `Button`, `MenuButton`, `SplitButton` and `Toggle` experimental components from the `@fluentui/react-experiments` package since they were never officially supported and are not being worked on.
- Deprecates the `Slider` experimental component in the `@fluentui/react-experiments` package  since it was never officially supported and it's not being worked on but contains changes that might be worth looking into when developing the converged version (hence the reason for deprecation but not removal).
- Updates the `MicroFeedback` component in the `@fluentui/react-experiments` package to use the `Button` component from `@fluentui/react` instead of the one we're removing from `@fluentui/react-experiments`.
- Removes the examples and vr-tests related to the removed components and updates imports for the examples related to the WIP converged `Card`.
- Removes the `Slots` related examples from the previous `foundation` work.

change/@fluentui-react-cards-3a360397-b8c4-476e-a326-22070332490b.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[BREAKING] Removing previous experimental implementation of Card and moving the version in the next folder to be the default export.",
+  "packageName": "@fluentui/react-cards",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

change/@fluentui-react-examples-ef9f6fa4-7b2c-4b8e-832b-5cb48165d1c2.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Removing examples of removed components.",
+  "packageName": "@fluentui/react-examples",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

change/@fluentui-react-experiments-a9e50579-3134-4efe-9761-a2764262647f.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[BREAKING] Removing Button, MenuButton, SplitButton and Toggle components. Deprecating Slider component. Updating MicroFeedback component to use Button in @fluentui/react instead of the removed Button in @fluentui/react-experiments.",
+  "packageName": "@fluentui/react-experiments",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/react-cards/.eslintrc.json

@@ -1,7 +1,4 @@
 {
-  "extends": ["plugin:@fluentui/eslint-plugin/react--legacy"],
-  "root": true,
-  "rules": {
-    "@typescript-eslint/no-explicit-any": "off"
-  }
+  "extends": ["plugin:@fluentui/eslint-plugin/react"],
+  "root": true
 }