Add new notification and update test-tools
Adds "chain API ready" notification which fixes problem with:
https://gitlab.syncad.com/hive/hive/-/jobs/844777
https://gitlab.syncad.com/hive/hive/-/jobs/843660
https://gitlab.syncad.com/hive/hive/-/jobs/844875
requires: test-tools!180 (merged)
Edited by Krzysztof Mochocki