fix: avoid forwarding hideMenu to menu items

[dejoski]

Summary

• avoid passing the internal hideMenu prop to direct menu item children in GridToolbarExportContainer
• wrap direct Material UI/base menu item onClick handlers to close the export menu instead
• add a regression test for a custom toolbar using a bare Material UI MenuItem

Closes #22909

Validation

• git diff --check
• npx pnpm@11.5.0 --version

Note: dependencies were not installed in this fresh local checkout, so I could not run the MUI X test suite locally before opening this PR.

[code-infra-dashboard]

Deploy preview

https://deploy-preview-22955--material-ui-x.netlify.app/

Bundle size

Bundle	Parsed size	Gzip size
@mui/x-data-grid	🔺+176B(+0.04%)	🔺+57B(+0.05%)
@mui/x-data-grid-pro	🔺+176B(+0.03%)	🔺+57B(+0.04%)
@mui/x-data-grid-premium	🔺+176B(+0.02%)	🔺+63B(+0.03%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-charts-premium	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)
@mui/x-license	0B(0.00%)	0B(0.00%)

Details of bundle changes

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