Fix sec bug with server creation roles/Java Version Select improvements

Andrewrequested to merge
tweak/java-version-retention into dev

What does this MR do and why?

Retains selected java versions inside of the config page. Fix sec bug where a post request could assign a server to any role - even roles the user doesn't have access to.

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  • Have you checked this doesn't interfere/conflict/duplicate someone elses work?
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Edited by Andrew

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