fix: Return slice of correct length from db.AddSchema (#2765)

## Relevant issue(s)

Resolves #2764

## Description

Return slice of correct length from db.AddSchema, values are appended to
this slice later in the function, but the result declaration is done as
if they will be set by index.

Bug also affected `db.AddView`.

internal/db/collection_define.go

@@ -29,7 +29,7 @@ func (db *db) createCollections(
 	ctx context.Context,
 	newDefinitions []client.CollectionDefinition,
 ) ([]client.CollectionDefinition, error) {
-	returnDescriptions := make([]client.CollectionDefinition, len(newDefinitions))
+	returnDescriptions := make([]client.CollectionDefinition, 0, len(newDefinitions))
 
 	existingDefinitions, err := db.getAllActiveDefinitions(ctx)
 	if err != nil {