perf(command): user grant pre-condition check using the search table (#8230)

# Which Problems Are Solved

Imporve the performance of user grant addition, especially for import.

# How the Problems Are Solved

Use the search table to query for the project grant state. 
This could easily be done by making the search used in
`checkProjectGrantPreCondition` reusable.

# Additional Changes

Chanded event declerations to `const` in the
`internal/repository/project` package.

# Additional Context

- Performance improvements for import are evaluated and acted upon
internally at the moment

---------

Co-authored-by: adlerhurst <silvan.reusser@gmail.com>
Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/grpc/feature/v2/converter.go

@@ -113,6 +113,8 @@ func improvedPerformanceTypeToPb(typ feature.ImprovedPerformanceType) feature_pb
 		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT_GRANT
 	case feature.ImprovedPerformanceTypeProject:
 		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT
+	case feature.ImprovedPerformanceTypeUserGrant:
+		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_USER_GRANT
 	default:
 		return feature_pb.ImprovedPerformance(typ)
 	}
@@ -141,6 +143,8 @@ func improvedPerformanceToDomain(typ feature_pb.ImprovedPerformance) feature.Imp
 		return feature.ImprovedPerformanceTypeProjectGrant
 	case feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT:
 		return feature.ImprovedPerformanceTypeProject
+	case feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_USER_GRANT:
+		return feature.ImprovedPerformanceTypeUserGrant
 	default:
 		return feature.ImprovedPerformanceTypeUnknown
 	}