test: flaky TestRemoteClient_StartBlockSubscription_And_GetBlock (bind address already in use)

[vgonkivs]

=== RUN   TestRemoteClient_StartBlockSubscription_And_GetBlock
testing.go:29: 
Error Trace:	/home/runner/work/celestia-node/celestia-node/core/testing.go:29
                        /home/runner/work/celestia-node/celestia-node/core/testing.go:41
        	        /home/runner/work/celestia-node/celestia-node/core/testing.go:55
        	        /home/runner/work/celestia-node/celestia-node/core/client_test.go:26
Error:      	Received unexpected error:
failed to listen on 127.0.0.1:39027: listen tcp 127.0.0.1:39027: bind: address already in use
Test:       	TestRemoteClient_StartBlockSubscription_And_GetBlock
--- FAIL: TestRemoteClient_StartBlockSubscription_And_GetBlock (0.03s)

[Bidon15]

this is still flaky in downgraded version of the core 0.34.x might be the case when one test has been finished but it hasn't finished closing the connection with core

Low-prio

[renaynay]

I see this very infrequently locally, but not often.

[renaynay]

Closing for now.