User security context to model args instead of user json

[darnissan]

user security context is component introduced in ms defender for cloud here https://learn.microsoft.com/en-us/azure/defender-for-cloud/gain-end-user-context-ai

this PR is for adding this object to the model args

Motivation and Context

Description

Contribution Checklist

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• I didn't break any existing functionality 😄

[sarah-widder]

Looks good. Thanks for the contribution!

[sarah-widder]

@darnissan please agree to the CLA and ping me to merge this one. Thanks!

[darnissan]

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[darnissan]

@microsoft-github-policy-service agree

[darnissan]

hey @sarah-widder , kindly reminder :)