fix(ci): restore vortex-compact file size tracking for PR clickbench

The matrix consolidation in #7448 dropped `extra_data_formats:
"vortex-compact"` from the clickbench entry. This meant PR clickbench
no longer generates vortex-compact data, so file size comparisons in
PR comments lost vortex-compact coverage.

Restore the field so `data-gen` produces vortex-compact files for file
size tracking without adding it as a benchmark target on PRs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Signed-off-by: Alexander Droste <alexander.droste@protonmail.com>

Author: 0ax1

.github/workflows/sql-benchmarks.yml

@@ -20,7 +20,8 @@ on:
               "id": "clickbench-nvme",
               "subcommand": "clickbench",
               "name": "Clickbench on NVME",
-              "targets": "datafusion:parquet,datafusion:vortex,duckdb:parquet,duckdb:vortex,duckdb:duckdb"
+              "targets": "datafusion:parquet,datafusion:vortex,duckdb:parquet,duckdb:vortex,duckdb:duckdb",
+              "extra_data_formats": "vortex-compact"
             },
             {
               "id": "tpch-nvme",