[Test] Replace time waiting with message submission waiting (#418)

e2e/tests/session.feature

@@ -5,11 +5,7 @@ Feature: Session Namespace
   Scenario: Supplier completes claim/proof lifecycle for a valid session
     Given the user has the pocketd binary installed
     When the supplier "supplier1" has serviced a session with "5" relays for service "svc1" for application "app1"
-    # TODO_TECHDEBT: Once the session grace period is configurable, set it to 0 at the beginning of this test.
-    # The timeout for when a claim can be submitted on-chain depends on `createClaimWindowStartHeight`, which
-    # is a function of `SessionGracePeriod`. The higher this value, the higher this timeout needs to be. Since
-    # this test is not dependant on the grace period, setting it to 0 and having a lower grace period will simplify it.
-    And the user should wait for "7" seconds
+    And the user should wait for the "proof" "CreateClaim" Message to be submited
     Then the claim created by supplier "supplier1" for service "svc1" for application "app1" should be persisted on-chain
     # TODO_IMPROVE: And an event should be emitted...
     And after the supplier submits a proof for the session for service "svc1" for application "app1"

e2e/tests/session_steps_test.go

@@ -42,6 +42,11 @@ const (
 	preExistingProofsKey = "preExistingProofsKey"
 )
 
+// TODO_TECHDEBT: Evaluate if/where/how this function should be reused in other tests
+func (s *suite) TheUserShouldWaitForTheMessageToBeSubmited(module, message string) {
+	s.waitForMessageAction(fmt.Sprintf("/poktroll.%s.Msg%s", module, message))
+}
+
 func (s *suite) AfterTheSupplierCreatesAClaimForTheSessionForServiceForApplication(serviceId, appName string) {
 	s.waitForMessageAction("/poktroll.proof.MsgCreateClaim")
 }