chore: discovery dialer e2e test investigation

[weboko]

Description

Newly added E2E test in PR fails in CI but succeeds locally.
Origin of the issue is not clear as dialing actually happens and connection is established.
It seems that waku.isConnected() doesn't actually succeed for that test.

Test: DiscoveryDialer -> should dial second nwaku node that was discovered.

Solution

Investigate what happens and resolve the issue.
Most likely we need to figure a proper way of using browser events in the context of CI.

Notest

Creating it as a follow up because correct behavior is confirmed with extensive dogfooding and unit testing.

[weboko]

Was hoping #2537 will resolve this issue - but so far it doesn't seem so.