[ci] Ignore log after shutdown for #3314 (#3316)

ignore message re: sequencer client in Failed state after shutdown

Signed-off-by: Raymond Roestenburg <[email protected]>

Author: ray-roestenburg-da

project/ignore-patterns/canton-standalone-sv4-reonboarding-new.ignore.txt

@@ -1,2 +1,4 @@
 # This does party migration
 ACS_COMMITMENT_MISMATCH
+# TODO(#3314): remove once 3.4-related integration tests do not require workaround for logs anymore, see 2589
+'sequencer-client' is now in state Failed.*The sequencer client's healthy subscriptions count is under the configured BFT threshold.*