chore(ci): disable duckdb-next-build temporarily

DuckDB main branch has breaking API changes (SetOperationNode.left/right
replaced with children vector). Will re-enable after adding compatibility.

Author: zfarrell

.github/workflows/MainDistributionPipeline.yml

@@ -12,13 +12,14 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  duckdb-next-build:
-   name: Build extension binaries
-   uses: duckdb/extension-ci-tools/.github/workflows/_extension_distribution.yml@main
-   with:
-     duckdb_version: main
-     ci_tools_version: main
-     extension_name: parser_tools
+  # TODO: Re-enable once compatible with DuckDB main (SetOperationNode API change)
+  # duckdb-next-build:
+  #  name: Build extension binaries
+  #  uses: duckdb/extension-ci-tools/.github/workflows/_extension_distribution.yml@main
+  #  with:
+  #    duckdb_version: main
+  #    ci_tools_version: main
+  #    extension_name: parser_tools
 
   duckdb-stable-build:
     name: Build extension binaries