core/services/ocr2/plugins/ccip: fix CLO test (#1230)

## Motivation

We were getting this log in the CLO integration test:

```
panic: Log in goroutine after Test_CLOSpecApprovalFlow_dynamicPriceGetter has completed: 2024-07-30T12:04:28.447Z	ERROR	Feeds	[email protected]/client.go:512	failed to connect to server at http://localhost:8080, got: [wsrpc] error while dialing dial tcp: lookup http on 127.0.0.53:53: server misbehaving	{"version": "2.14.0-ccip1.4.13@dadff37"}  
```

This appears to be due to the wsrpc client trying to connect to the CLO
server when it doesn't actually exist. We set the mocked out connection
manager previously, but it happened after the RegisterManager call, when
it should be before.

## Solution

Set the connections manager of the feeds service to the mock connection
manager prior to registering the manager, since registering triggers a
connect loop which uses wsrpc and has reconnection logic.

core/services/ocr2/plugins/ccip/testhelpers/integration/chainlink.go

@@ -639,14 +639,15 @@ func (c *CCIPIntegrationTestHarness) SetupFeedsManager(t *testing.T) {
 			PublicKey: *pkey,
 		}
 
-		_, err = f.RegisterManager(testutils.Context(t), m)
-		require.NoError(t, err)
-
 		connManager := feedsMocks.NewConnectionsManager(t)
+		connManager.On("Connect", mock.Anything).Maybe()
 		connManager.On("GetClient", mock.Anything).Maybe().Return(NoopFeedsClient{}, nil)
 		connManager.On("Close").Maybe().Return()
 		connManager.On("IsConnected", mock.Anything).Maybe().Return(true)
 		f.Unsafe_SetConnectionsManager(connManager)
+
+		_, err = f.RegisterManager(testutils.Context(t), m)
+		require.NoError(t, err)
 	}
 }