Add proper error handling and remove unnecessary variable definition

[hlts2]

WHAT

I fixed an small issue where errors were not being handled correctly in the test code.
Additionally, I removed an unnecessary variable definition.

WHY

There were parts of the test code where errors were being handled, but no errors were assigned.
I believe this needs to be fixed.

• e.g.) ./e2e/suite_test.go:104-113
  • we need to assign the result of the e2eTest.tenantClient.Update method to err variable

err = e2eTest.tenantClient.Get(context.TODO(), client.ObjectKey{Namespace: "kube-system", Name: "civo-csi-controller"}, controller)
if err != nil {
	log.Panic(err)
}

controller.Spec.Template.Spec.Containers[3].Image = Image

e2eTest.tenantClient.Update(context.TODO(), controller) <- we need to assign result to err variable
if err != nil {
	log.Panic(err)
}

I also found sections where the code worked correctly without the variable definition, so I removed it.

FYI

• The following is the result of all unit test on Local environment

❯ go clean -testcache && go test ./...
ok  	github.com/civo/civo-csi	70.103s
ok  	github.com/civo/civo-csi/e2e	0.007s
ok  	github.com/civo/civo-csi/pkg/driver	10.013s

• The following is the result of all unit test on CI environment
  • https://github.com/civo/civo-csi/actions/runs/11773981531/job/32791775537

[hlts2]

@Praveen005
Thank you for reviewing it!
I will merge this PR 🚀