Add custom agent to migrate code from v9 to v8

packages/charts/.github/agents/v9tov8Migration.agent.md

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+---
+description: 'Migrate code from functional component(v9) to class component(v8) in accordance with Fluent UI standards.'
+tools: ['vscode', 'execute', 'read', 'edit', 'search', 'web', 'agent', 'todo']
+---
+
+**Difference between v8 and v9:**
+
+- **v8**:
+
+  1. class component code written inside `packages/charts/react-charting`.
+  2. Traditional component lifecycle methods (e.g., componentDidMount, componentDidUpdate).
+  3. State is managed using this.state and this.setState.
+  4. Props accessed via this.props.
+
+- **v9**:
+  1. functional component code written inside `packages/charts/react-charts`.
+  2. Utilizes React hooks (e.g., useState, useEffect) for state and lifecycle management.
+  3. State is managed using useState hook.
+  4. Direct props destructuring.
+
+**Difference between v8 styles file and v9 styles file:**
+
+- **example v8 styles file:**
+  `import { FontWeights } from '@fluentui/react/lib/Styling';
+ import { IHeatMapChartStyleProps, IHeatMapChartStyles } from './HeatMapChart.types';
+ export const getHeatMapChartStyles = (props: IHeatMapChartStyleProps): IHeatMapChartStyles => {
+  const { theme } = props;
+  return {
+    root: {},
+    text: [
+      theme.fonts.medium,
+      {
+        pointerEvents: 'none',
+        fontWeight: FontWeights.semibold,
+      },
+    ],
+    subComponentStyles: {},
+  };
+};`
+
+- **_Some important points to note:_**
+
+  - Uses mergeStyleSets from @fluentui/react/lib/Styling
+  - Exports a function that returns styles (e.g., getHeatMapChartStyles)
+  - Uses theme-based styling with theme.fonts, theme.palette
+  - Styles are defined as objects or arrays of style rules
+  - Interfaces have I prefix (e.g., IHeatMapChartStyleProps, IHeatMapChartStyles)
+
+- **example v9 styles file:**
+  `'use client';
+  import { makeStyles, mergeClasses } from '@griffel/react';
+  import type { HeatMapChartProps, HeatMapChartStyles } from './HeatMapChart.types';
+  import type { SlotClassNames } from '@fluentui/react-utilities';
+  import { typographyStyles } from '@fluentui/react-theme';
+
+  export const heatmapChartClassNames: SlotClassNames<HeatMapChartStyles> = {
+  root: 'fui-hmc**root',
+  text: 'fui-hmc**text',
+  calloutContentRoot: 'fui-hmc\_\_calloutContentRoot',
+  xAxis: '',
+  yAxis: '',
+  legendContainer: '',
+  hover: '',
+  descriptionMessage: '',
+  tooltip: '',
+  axisTitle: '',
+  chartTitle: '',
+  opacityChangeOnHover: '',
+  shapeStyles: '',
+  chartWrapper: '',
+  svgTooltip: '',
+  chart: '',
+  axisAnnotation: '',
+  plotContainer: '',
+  annotationLayer: '',
+  };
+  const useStyles = makeStyles({
+  root: {},
+  text: {
+  ...typographyStyles.body1Strong,
+  pointerEvents: 'none',
+  },
+  calloutContentRoot: {
+  maxWidth: '238px',
+  },
+  });
+
+  export const useHeatMapChartStyles = (props: HeatMapChartProps): HeatMapChartStyles => {
+  const baseStyles = useStyles();
+
+  return {
+  root: mergeClasses(heatmapChartClassNames.root, baseStyles.root /_, props.styles?.root_/),
+  text: mergeClasses(heatmapChartClassNames.text, baseStyles.text /_, props.styles?.text_/),
+  calloutContentRoot: mergeClasses(
+  heatmapChartClassNames.calloutContentRoot,
+  baseStyles.calloutContentRoot /_, props.styles?.calloutContentRoot_/,
+  ),
+  };
+  };`
+
+- **_Some important points to note:_**
+
+  - Uses makeStyles and mergeClasses from @griffel/react
+  - Exports a hook function that returns styles (e.g., useHeatMapChartStyles)
+  - Uses typographyStyles from @fluentui/react-theme for text styles
+  - Styles are defined as objects within makeStyles
+  - Interfaces do not have I prefix (e.g., HeatMapChartProps, HeatMapChartStyles)
+
+- Migrate the provided v9 functional component code to a v8 class component code, ensuring to replace hooks with appropriate lifecycle methods and state management.
+
+- Follow all the migration steps mentioned below to ensure a successful migration.
+
+- **Migration steps:**
+  1. Take the commit id from the user which needs to be migrated from v9 to v8.
+  2. use git commands to fetch the file content from that commit.
+  3. Use the above differences and points to convert the functional component code to class component code.
+  4. Ensure all changes of that particular commit are addressed in the migration. **_ONLY MAKE CODE CHANGES FROM THAT COMMIT. DO NOT MAKE ANY OTHER CHANGES._**
+  5. **_IMPORTANT:_** After migration, run `yarn build` to build the `react-charting` package and ensure there are no build errors.
+  6. **_IMPORTANT:_** Then run `npx cross-env TZ=UTC jest` to ensure all tests are passing. If there are snapshots failures, update the snapshots by running `npx cross-env TZ=UTC jest -u`.