Load g-cloud-7 service editing manifest
Load g-cloud-7 service editing manifest

Manifests are loaded initially and then retrieved when they're needed.
This means they'll fail if one tries to retrieve a manifest that wasn't
loaded.
In this case, the `edit_service` manifest for G-Cloud 7 wasn't loaded,
so if any supplier tried to view/remove one of their G7 services, they
would get a 500-level (ContentNotFound) error.
Adding the manifest solves the problem.

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