feat(policy): allow evidence and string material kind (#2305)

Signed-off-by: Sylwester Piskozub <sylwesterpiskozub@gmail.com>

Author: Piskoo

app/controlplane/api/gen/frontend/workflowcontract/v1/crafting_schema.ts

@@ -280,14 +280,8 @@ message PolicySpecV2 {
   }
 
   // if set, it will match any material supported by Chainloop
-  // except those not having a direct schema (STRING, ARTIFACT, EVIDENCE), since their format cannot be guessed by the crafter.
-  // CONTAINER, HELM_CHART are also excluded, but we might implement custom policies for them in the future.
   CraftingSchema.Material.MaterialType kind = 3 [(buf.validate.field).enum = {
-    not_in: [
-      1,
-      3,
-      11
-    ]
+    not_in: [3]
   }];
 }