Import API fails to provide validation message for non-existent group

Description

If a group doesn't exist, import API returns a 500, but should return a message indicating that the group must be created when validateDbconstraints: true is set per message from API response

Observed versions

1.51.1

Affects versions

The version, or versions where this bug exists. If you do not know, please leave blank for now.

Steps to reproduce

Steps to reproduce the behavior:

Create a new tenant and application in that tenant
Copy this request (the bottom of import)
Modify the request to include validateDbConstraints:true
Modify the request to also reference the application in the tenant made in step one
Limit the request to the new tenant from step one (blank slate)
Watch the request fail, with no validation messages

Expected behavior

We should be returning something indicating that groupId doesn't exist (cb5c83f-53ff-4d16-88bd-c5e3802111a5)

"memberships": [
                {
                    "data": {
                        "externalId": "cc6714c6-286c-411c-a6bc-ee413cda1dbc"
                    },
                    "groupId": "2cb5c83f-53ff-4d16-88bd-c5e3802111a5"
                }
            ]

Screenshots

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Platform

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Device: [e.g. Desktop, iPhone X, Pixel 3, etc]
OS: [e.g. iOS, macOS, Windows ME]
Browser + version [e.g. chrome, safari plus a version]
Database [MySQL | PostgresSQL] & and version

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Additional context

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FusionAuth / fusionauth-issues