test: convert test_table_names to test both remote and local (#2888)

Convert test_table_names to test both remote and local connections.

This PR also includes some miscellaneous improvements in
src/test_utils/connection.rs. It starts a thread to drain stdout from
the server process. It adds the
PRINT_LANCEDB_TEST_CONNECTION_SCRIPT_OUTPUT environment variable, which
optionally displays server stdout.

Fix a bash conditional in run_with_test_connection.sh.

ci/run_with_test_connection.sh

@@ -16,7 +16,7 @@ check_command_exists() {
 }
 
 if [[ ! -e ./lancedb ]]; then
-    if [[ -v SOPHON_READ_TOKEN ]]; then
+    if [[ x${SOPHON_READ_TOKEN} != "x" ]]; then
         INPUT="lancedb-linux-x64"
         gh release \
             --repo lancedb/lancedb \