Always skip vitess tests in dev setup
Enable them by running the tests:
```
env SKIP_CONNECTORS="" cargo test vitess_5_7 -- --test-threads=1
```
@@ -3,6 +3,7 @@ export RUST_LOG_FORMAT=devel
export RUST_BACKTRACE=1
export RUST_LOG=query_engine=debug,quaint=debug,query_core=trace,query_connector=debug,sql_query_connector=debug,prisma_models=debug,engineer=info,sql_introspection_connector=debug
export LOG_QUERIES=y
+export SKIP_CONNECTORS="vitess_5_7,vitess_8_0"
# Controls Scala test kit verbosity. Levels are trace, debug, info, error, warning
export LOG_LEVEL=debug
