…stic#197046)

## Summary

Fixes handling of `schema.nullable(schema.object({..}))` to params and
query inputs. [Example in the
wild](https://github.com/jloleysens/kibana/blob/83e76cb4d854a3c3f9ffdaad8c6ee29d66d56710/x-pack/plugins/reporting/server/routes/common/generate/request_handler.ts#L33).

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

(cherry picked from commit d3569f6)

…uery params (#197046) (#197801)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[OAS] Fix handling of `schema.nullable` to path and query
params (#197046)](#197046)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Fix handling of `schema.nullable` to path and query params
(#197046)\n\n## Summary\r\n\r\nFixes handling of
`schema.nullable(schema.object({..}))` to params and\r\nquery inputs.
[Example in
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Fix handling of `schema.nullable` to path and query
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Fix handling of `schema.nullable` to path and query params
(#197046)\n\n## Summary\r\n\r\nFixes handling of
`schema.nullable(schema.object({..}))` to params and\r\nquery inputs.
[Example in
the\r\nwild](https://github.com/jloleysens/kibana/blob/83e76cb4d854a3c3f9ffdaad8c6ee29d66d56710/x-pack/plugins/reporting/server/routes/common/generate/request_handler.ts#L33).\r\n\r\n\r\n###
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Fix handling of `schema.nullable` to path and query params
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[Example in
the\r\nwild](https://github.com/jloleysens/kibana/blob/83e76cb4d854a3c3f9ffdaad8c6ee29d66d56710/x-pack/plugins/reporting/server/routes/common/generate/request_handler.ts#L33).\r\n\r\n\r\n###
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BACKPORT-->

Co-authored-by: Jean-Louis Leysens <jeanlouis.leysens@elastic.co>