ci: add a dedicated pg_tle test job

[jnasbyupgrade]

There was no CI coverage for cat_tools' pgxntool-generated pg_tle (Trusted Language Extensions) deployment path, so a regression there (e.g. in the generated registration SQL) could ship unnoticed. This adds a pg-tle-test job that builds pg_tle from source, registers cat_tools with it via make run-pgtle, and verifies the extension installs and works correctly with no filesystem control file present -- i.e. purely through pg_tle's database-backed registration.

The job always runs on its own freshly-started cluster, never shared with the other jobs in this workflow: pg_tle requires shared_preload_libraries and mixing pg_tle/non-pg_tle extension installs on one cluster can misbehave.

The matrix covers PG 12-18, matching pg_tle 1.5.2's supported range per pgxntool/pgtle_versions.md (PG10/11 predate pg_tle support).

This intentionally stops at a smoke test rather than running the full pg_regress/pgTap suite through pg_tle: pg_regress always creates its test database from the pristine template0, so any pre-registration done in another database (e.g. postgres or template1) is invisible to it. Routing the full suite through pg_tle would require adding registration SQL into test/install/*.sql, which runs inside every job's pg_regress invocation (not just this one) and would need conditional logic to avoid affecting the other, non-pg_tle jobs -- more invasive than this task calls for.

Verification

Locally verified end-to-end against a scratch PostgreSQL 16 cluster in an isolated container (built pg_tle 1.5.2 from source, registered cat_tools via make run-pgtle, confirmed CREATE EXTENSION cat_tools succeeds with zero filesystem trace, and confirmed a real query against cat_tools.pg_class_v returns data) before pushing this branch. CI is still pending -- especially interested to see whether all of PG 12-18 build/pass cleanly, since some versions may need to be dropped from the matrix (that's fine per the task).

Test plan

• CI green on the new pg-tle-test job across the PG 12-18 matrix (or matrix adjusted down if some versions don't support pg_tle 1.5.2 cleanly)
• Other existing jobs unaffected

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