chore: remove unused SCIM setting - assumeControlOfExisting

[nunogois]

This property is unused and should be removed.

This fixes a logged schema error:

Invalid response: {
    "schema": "#/components/schemas/scimSettingsSchema",
    "errors": [
        {
            "instancePath": "",
            "schemaPath": "#/required",
            "keyword": "required",
            "params": {
                "missingProperty": "assumeControlOfExisting"
            },
            "message": "must have required property 'assumeControlOfExisting'"
        }
    ]
}

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[sighphyre]

Nice, thank you!