fix: skip ProcessUtility hook in databases without the extension (whole-DB ANALYZE)

[wezell]

Problem

On the OVH cluster (pg_deltax in shared_preload_libraries), a whole-database ANALYZE; fails in every database that never ran CREATE EXTENSION pg_deltax — i.e. all 40+ dotCMS tenant DBs:

$ psql -d dot-dotcms-corp-headless-auth -c 'ANALYZE;'
ERROR:  relation "deltax.deltax_partition" does not exist
QUERY:  SELECT schema_name, table_name FROM deltax.deltax_partition WHERE is_compressed = true

Per-table ANALYZE public.foo; works; only the rels = NIL (whole-DB) form breaks.

Root cause

restore_compressed_partition_stats() (src/copy.rs) runs after a whole-DB VACUUM/ANALYZE and queries deltax.deltax_partition unconditionally. dotcms-0.2.0 guards the DDL path only — lookup_target() in src/ddl.rs (307bf31, issue xataio#24 follow-up) — so ALTER TABLE is safe but the vacuum path is not.

Upstream fixed this generally in xataio#25 by bailing out at the top of the ProcessUtility hook. That commit is not an ancestor of dotcms-0.2.0.

Fix

Cherry-pick upstream 8ff22d4 (xataio#25) verbatim:

• catalog::catalog_present() — two syscache lookups (get_namespace_oid(missing_ok) + get_relname_relid), no SPI.
• deltax_process_utility() bails to chain_to_prev() when it returns false, before restore_stats_after_vacuum is computed — so it covers both restore_compressed_partition_stats() call sites and every other interception path (COPY, RENAME, GRANT, ALTER SCHEMA).
• tests/test_no_extension_db.py — 4 regression tests, including test_vacuum_analyze_without_extension, which exercises exactly the failing ANALYZE (rels = NIL) form.

Syscache lookups do no schema-ACL check, so this also sidesteps the permission denied for schema deltax failure mode that forced 307bf31 (tenant roles lacking USAGE on a deltax schema inherited from template1).

src/ddl.rs's existing guard is left in place — now redundant, but harmless and out of scope.

Verification

• Cherry-pick applied clean (no conflicts).
• cargo fmt -- --check clean.
• get_namespace_oid / get_relname_relid are already used on this branch (src/scan/hook.rs, src/scan/cost.rs, src/scan/exec/segments.rs) with the same pgrx 0.17 signatures.
• tests/conftest.py on this branch exports every symbol the new test imports (HOST_PORT, PG_USER, PG_PASSWORD, _admin_conn, pg_container).

Next steps (not done here)

1. Merge → tag v0.2.0-dotcms.6 on the merge commit → release.yml builds the 4 .debs.
2. In ovh-k8s-cluster, bump ARG PG_DELTAX_VERSION in postgres-cnpg/Dockerfile — its validate check races the fork release, so re-run it once the assets exist.
3. Roll postgres-ovh-east by patching the live Cluster imageName to the new digest.

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