fix: clear relationships properly when unloading new records #8791
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Description
Unloading a new record that is related to another record does not remove it from the relationships. This then causes issues if the other record also is unloaded or if code expects the relationships to no longer include the unloaded record. This adds a failing test case.
This behavior seems to have changed in EmberData v4.7+, older versions seemingly work as expected.
Related Discord thread: https://discord.com/channels/480462759797063690/1143193491250368583
Similar issue: #8262