…ection header

- Added an <el-empty> component to display when data is not available
- Updated bulk select header to render only if there is selection and data

- Added <el-empty> component to display when total executions are 0
- Updated conditional rendering for info container and chart display based on total executions

- Added conditional rendering for the executions table in Executions.vue to avoid displaying two empty states on the same page.
- Implemented similar changes for the flows table in Flows.vue.

…n logic

- Added a new `total` prop to the Doughnut.vue component with type Number.
- Implemented similar logic from executions/Bar.vue into executions/Doughnut.vue for consistency in handling total executions.

- Added an `<el-empty>` component to display when `hasStatsData` is false.
- Enhanced validation logic in `<template #table>` on line 58 for improved data handling.

- Added translation for "no data" corresponding to "No data available" in `kestra/ui/src/translations/en.json`.

- Wrapped the existing Bar component in a div that checks if `props.data.length > 0`.
- Added an <el-empty> component.