Bridge zombienet tests - move all test scripts to the same folder (#3333)

Related to https://github.com/paritytech/polkadot-sdk/issues/3242

bridges/testing/environments/rococo-westend/spawn.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+set -e
+
+trap "trap - SIGTERM && kill -9 -$$" SIGINT SIGTERM EXIT
+
+source "${BASH_SOURCE%/*}/../../utils/zombienet.sh"
+
+# whether to init the chains (open HRMP channels, set XCM version, create reserve assets, etc)
+init=0
+start_relayer=0
+while [ $# -ne 0 ]
+do
+    arg="$1"
+    case "$arg" in
+        --init)
+            init=1
+            ;;
+        --start-relayer)
+            start_relayer=1
+            ;;
+    esac
+    shift
+done
+
+logs_dir=$TEST_DIR/logs
+helper_script="${BASH_SOURCE%/*}/helper.sh"
+
+rococo_def=${BASH_SOURCE%/*}/bridge_hub_rococo_local_network.toml
+start_zombienet $TEST_DIR $rococo_def rococo_dir rococo_pid
+echo
+
+westend_def=${BASH_SOURCE%/*}/bridge_hub_westend_local_network.toml
+start_zombienet $TEST_DIR $westend_def westend_dir westend_pid
+echo
+
+if [[ $init -eq 1 ]]; then
+  rococo_init_log=$logs_dir/rococo-init.log
+  echo -e "Setting up the rococo side of the bridge. Logs available at: $rococo_init_log\n"
+
+  westend_init_log=$logs_dir/westend-init.log
+  echo -e "Setting up the westend side of the bridge. Logs available at: $westend_init_log\n"
+
+  $helper_script init-asset-hub-rococo-local >> $rococo_init_log 2>&1 &
+  rococo_init_pid=$!
+  $helper_script init-asset-hub-westend-local >> $westend_init_log 2>&1 &
+  westend_init_pid=$!
+  wait -n $rococo_init_pid $westend_init_pid
+
+
+  $helper_script init-bridge-hub-rococo-local >> $rococo_init_log 2>&1 &
+  rococo_init_pid=$!
+  $helper_script init-bridge-hub-westend-local >> $westend_init_log 2>&1 &
+  westend_init_pid=$!
+  wait -n $rococo_init_pid $westend_init_pid
+
+  run_zndsl ${BASH_SOURCE%/*}/rococo-init.zndsl $rococo_dir
+  run_zndsl ${BASH_SOURCE%/*}/westend-init.zndsl $westend_dir
+fi
+
+if [[ $start_relayer -eq 1 ]]; then
+  ${BASH_SOURCE%/*}/start_relayer.sh $rococo_dir $westend_dir relayer_pid
+fi
+
+echo $rococo_dir > $TEST_DIR/rococo.env
+echo $westend_dir > $TEST_DIR/westend.env
+echo
+
+wait -n $rococo_pid $westend_pid $relayer_pid
+kill -9 -$$