runtime: add materialize-azure-fabric-warehouse to ser_policy

Azure Fabric Warehouse has a 1MB size limit on VARCHAR(MAX) columns, so we need
to try to stay below that size for any individual string field, and probably
more importantly the entire document, since the document is stored in such a
column.

Author: williamhbaker

Diff for: crates/runtime/src/materialize/task.rs

@@ -32,6 +32,7 @@ impl Task {
         // that don't handle large strings very well. This should be negotiated via connector protocol.
         // See go/runtime/materialize.go:135
         let ser_policy = if [
+            "ghcr.io/estuary/materialize-azure-fabric-warehouse",
             "ghcr.io/estuary/materialize-bigquery",
             "ghcr.io/estuary/materialize-kafka",
             "ghcr.io/estuary/materialize-snowflake",