User Management - role list should be sorted by name

[legrego]

Summary

This PR updates the GET /api/security/role endpoint to return the list of roles sorted by their name, instead of the ES default of creation date.

Fixes #18236

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Pinging @elastic/kibana-security

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[kobelb]

I'm fine with this being sorted at the API level since this is a public API, but if we want to ensure the sorting in specific places in the UI it feels like we should be doing explicit sorting there.

[legrego]

I'm fine with this being sorted at the API level since this is a public API, but if we want to ensure the sorting in specific places in the UI it feels like we should be doing explicit sorting there.

I was torn on this as well...on one hand, I like that the sort logic is in one place, so that consumers don't have to worry about it, and we get a consistent experience "for free", but OTOH, the display logic is less explicit, and figuring out why the sort is a particular way requires more digging