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

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

bridges/testing/tests/0002-mandatory-headers-synced-while-idle/run.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -e
+
+source "${BASH_SOURCE%/*}/../../utils/common.sh"
+source "${BASH_SOURCE%/*}/../../utils/zombienet.sh"
+
+# We use `--relayer-delay` in order to sleep some time before starting relayer.
+# We want to sleep for at least 1 session, which is expected to be 60 seconds for test environment.
+${BASH_SOURCE%/*}/../../environments/rococo-westend/spawn.sh &
+env_pid=$!
+
+ensure_process_file $env_pid $TEST_DIR/rococo.env 400
+rococo_dir=`cat $TEST_DIR/rococo.env`
+echo
+
+ensure_process_file $env_pid $TEST_DIR/westend.env 180
+westend_dir=`cat $TEST_DIR/westend.env`
+echo
+
+# Sleep for some time before starting the relayer. We want to sleep for at least 1 session,
+# which is expected to be 60 seconds for the test environment.
+echo -e "Sleeping 90s before starting relayer ...\n"
+sleep 90
+${BASH_SOURCE%/*}/../../environments/rococo-westend/start_relayer.sh $rococo_dir $westend_dir relayer_pid
+
+# Sometimes the relayer syncs multiple parachain heads in the begining leading to test failures.
+# See issue: https://github.com/paritytech/parity-bridges-common/issues/2838.
+# TODO: Remove this sleep after the issue is fixed.
+echo -e "Sleeping 180s before runing the tests ...\n"
+sleep 180
+
+run_zndsl ${BASH_SOURCE%/*}/rococo-to-westend.zndsl $westend_dir
+run_zndsl ${BASH_SOURCE%/*}/westend-to-rococo.zndsl $rococo_dir
+