Use more permissive validation in request mock

[joshdover]

Summary

After #51919 we started allowing request input fields to be of any shape, not just objects. However, we never updated the KibanaRequest mock to allow this.

This PR changes the default validation for the mock to schema.any() but allows the consumer to specify custom validation for testing.

Checklist

Delete any items that are not applicable to this PR.

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• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[mshustov]

I'm wondering how many ppl will define validation in tests at all 😄 probably schema.any would be enough

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 0de7e33

History

• 💚 Build #29000 succeeded e8d08448a24d801224d70d6ddf626f06676ddeb8

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