removed unused variables (#2692)

## Description



closes: #2486 

---

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checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

- [x] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [x] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/main/docs/docs/building-modules/10-structure.md).
- [ ] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [x] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [ ] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [x] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [x] Re-reviewed `Files changed` in the Github PR explorer
- [ ] Review `Codecov Report` in the comment section below once CI passes

modules/core/04-channel/keeper/handshake_test.go

@@ -639,7 +639,8 @@ func (suite *KeeperTestSuite) TestChanCloseInit() {
 			// create channel in init
 			path.SetChannelOrdered()
 			err = path.EndpointA.ChanOpenInit()
-
+			suite.Require().NoError(err)
+
 			// ensure channel capability check passes
 			suite.chainA.CreateChannelCapability(suite.chainA.GetSimApp().ScopedIBCMockKeeper, path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID)
 			channelCap = suite.chainA.GetChannelCapability(path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID)

modules/core/04-channel/keeper/packet_test.go

@@ -23,13 +23,8 @@ var (
 	defaultTimeoutHeight     = clienttypes.NewHeight(1, 100)
 
 	// for when the testing package cannot be used
-	clientIDA  = "clientA"
-	clientIDB  = "clientB"
-	connIDA    = "connA"
-	connIDB    = "connB"
-	portID     = "portid"
-	channelIDA = "channelidA"
-	channelIDB = "channelidB"
+	connIDA = "connA"
+	connIDB = "connB"
 )
 
 // TestSendPacket tests SendPacket from chainA to chainB