CI(benchmarking): move psql queries to actions/run-python-test-set (#8230)

## Problem

Some of the Nightly benchmarks fail with the error
```
+ /tmp/neon/pg_install/v14/bin/pgbench --version
/tmp/neon/pg_install/v14/bin/pgbench: error while loading shared libraries: libpq.so.5: cannot open shared object file: No such file or directory
```
Originally, we added the `pgbench --version` call to check that
`pgbench` is installed and to fail earlier if it's not.
The failure happens because we don't have `LD_LIBRARY_PATH` set for
every job, and it also affects `psql` command.
We can move it to `actions/run-python-test-set` so as not to duplicate
code (as it already have `LD_LIBRARY_PATH` set).

## Summary of changes
- Remove `pgbench --version` call
- Move `psql` commands to common `actions/run-python-test-set`

.github/actions/run-python-test-set/action.yml

@@ -179,7 +179,15 @@ runs:
 
         # Wake up the cluster if we use remote neon instance
         if [ "${{ inputs.build_type }}" = "remote" ] && [ -n "${BENCHMARK_CONNSTR}" ]; then
-          ${POSTGRES_DISTRIB_DIR}/v${DEFAULT_PG_VERSION}/bin/psql ${BENCHMARK_CONNSTR} -c "SELECT version();"
+          QUERIES=("SELECT version()")
+          if [[ "${PLATFORM}" = "neon"* ]]; then
+            QUERIES+=("SHOW neon.tenant_id")
+            QUERIES+=("SHOW neon.timeline_id")
+          fi
+
+          for q in "${QUERIES[@]}"; do
+            ${POSTGRES_DISTRIB_DIR}/v${DEFAULT_PG_VERSION}/bin/psql ${BENCHMARK_CONNSTR} -c "${q}"
+          done
         fi
 
         # Run the tests.