Store full CollectionId in V2 receipt database records (#817)

Remove `.as_address()` call that was truncating 32-byte CollectionId
  to 20-byte address, causing parsing issues in tap-agent notifications.

Author: neithanmo

crates/service/src/tap/receipt_store.rs

@@ -345,9 +345,9 @@ impl DbReceiptV2 {
         receipt: &tap_graph::v2::SignedReceipt,
         separator: &Eip712Domain,
     ) -> anyhow::Result<Self> {
-        let collection_id = thegraph_core::CollectionId::from(receipt.message.collection_id)
-            .as_address()
-            .encode_hex();
+        let collection_id =
+            thegraph_core::CollectionId::from(receipt.message.collection_id).encode_hex();
+
         let payer = receipt.message.payer.encode_hex();
         let data_service = receipt.message.data_service.encode_hex();
         let service_provider = receipt.message.service_provider.encode_hex();