Address staticcheck failures for test/e2e/node/...

Fix the `staticcheck` failures for `test/e2e/node`. All of the
staticcheck errors were for variables which were never used. When these
values were `err`, we added processing for the errors. When they were
values that were just never used, we stopped giving them a name.

hack/.staticcheck_failures

@@ -88,7 +88,6 @@ test/e2e/lifecycle
 test/e2e/lifecycle/bootstrap
 test/e2e/manifest
 test/e2e/network
-test/e2e/node
 test/e2e/storage
 test/e2e/storage/drivers
 test/e2e/storage/testsuites