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chore: bump MUI to v9 (#12014)

Last step of the migration to MUI v9. 
There are a lot of changes, but most come from a codemod updating
Typography props (`npx @mui/codemod@latest
deprecations/typography-props`), and also from updating import
paths/names of icons.

## Code changes

| Category | Migration | Files |
|---|---|---|
| **Icon renames** | `CheckCircleOutline` →
`CheckCircleOutlineOutlined`, same for `HelpOutline`, `ErrorOutline`,
`DeleteOutline`. v9 aligned icon naming with Material Symbols (every
variant gets an explicit suffix). | 20 imports across ~18 files |
| **Autocomplete params** | `params.InputProps` →
`params.slotProps.input`. v9 normalized `AutocompleteRenderInputParams`
to use slot vocabulary directly. | `AutocompleteBox.tsx` |
| **Grid direction** | `direction='column'` is no longer valid (v9 Grid
supports row layouts only; use Stack or sx for columns). Moved to `sx={{
flexDirection }}`. Also moved direct `justifyContent=` to `sx`. |
`GridCol.tsx`, `Footer.tsx` |
| **Accordion** | `TransitionProps` → `slotProps.transition` |
`SegmentItem.tsx`, `FeatureOverviewEnvironment.tsx` |
| **Menu** | `MenuListProps` → `slotProps.list` |
`CopyStrategyIconMenu.tsx`, `EnvironmentVariantsCopyFrom.tsx`,
`PushVariantsButton.tsx` |
| **Modal** | `BackdropComponent` → `slots.backdrop`, `BackdropProps` →
`slotProps.backdrop` | `SidebarModal.tsx` |
| **Dead type ref** | Removed unused `FormHelperTextProps?:
TextFieldProps['FormHelperTextProps']` (the parent prop no longer exists
in v9) | `InputListField.tsx` |
| **ButtonBase a11y** | Added `nativeButton={false}` to `<ListItemButton
component={Link}>` / `<StyledButton component={Link}>`. v9 warns when a
button component resolves to a non-button root without this
acknowledgment. Other ~30 sites left for a follow-up PR. | sidebar nav,
admin menu, EnterpriseEdgeDismissibleAlert |

## Test fixes

| Test | Issue | Fix |
|---|---|---|
| `ProjectFeaturesBatchActions.test.tsx` | Test never had
`UPDATE_FEATU... (continued)

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