replace contains with equals (#1385)

## Motivation

When simulating slow load on testnet, the load gen was getting applied
to multiple networks.


## Solution

Replace contains check with EqualFold. Also add some logs to make it
easier to understand.

integration-tests/ccip-tests/load/helper.go

@@ -111,8 +111,15 @@ func (l *LoadArgs) scheduleForDest(destNetworkName string) []*wasp.Segment {
 	// if found, use that frequency for the destination network
 	// otherwise, use the default frequency
 	if l.TestCfg.TestGroupInput.LoadProfile.FrequencyByDestination != nil {
+		l.lggr.Debug().
+			Interface("FrequencyByDestination", l.TestCfg.TestGroupInput.LoadProfile.FrequencyByDestination).
+			Msg("LoadProfile provided")
 		for networkName, freq := range l.TestCfg.TestGroupInput.LoadProfile.FrequencyByDestination {
-			if strings.Contains(destNetworkName, strings.ToLower(networkName)) {
+			l.lggr.Debug().Str("Destination", destNetworkName).Str("NetworkName", networkName).Msg("Checking frequency for destination")
+			if strings.EqualFold(destNetworkName, networkName) {
+				l.lggr.Info().Str("Destination", destNetworkName).
+					Ints64("RequestPerUnitTime", freq.RequestPerUnitTime).
+					Msg("Using frequency for destination")
 				return WaspSchedule(
 					freq.RequestPerUnitTime,
 					l.TestCfg.TestGroupInput.LoadProfile.TestDuration,