fix: linux-amd64-e2e job timeout issue

Assume etcd-io#16916 as baseline. The E2E takes `1395.082s`.

* etcd-io#16988

It introduced `TestAuthority` which takes `18.39s`.
And after etcd-io#16997, it takes `50.05s`.

* etcd-io#16995

It introduced `TestInPlaceRecovery` which takes `17.37s`.

* etcd-io#17144

  - New `TestHTTPHealthHandler` takes `29.9s`
  - New `TestHTTPLivezReadyzHandler` takes `35.20s`

* etcd-io#17173

  - New `TestMemberReplace` takes `7.55s`.

Ideally, it should increase `140.07s`. It's not larger than `1800s`
timeout value.

However, we run E2E cases 3 times. By default, we run E2E cases with
`-cpu 1,2,4`. That means that we run 3 times.

```bash
$ go help testflag

 -count n
            Run each test, benchmark, and fuzz seed n times (default 1).

            If -cpu is set, run n times for each GOMAXPROCS value.
            Examples are always run once. -count does not apply to
            fuzz tests matched by -fuzz.
```

I don't think we should run E2E with different GOMAXPROCS value. All the
`TestXYZ` are used to control etcd process and we don't set GOMAXPROCS
env to etcd process. So, we don't need `-cpu` setting for E2E.

Closes: etcd-io#17241

Signed-off-by: Wei Fu <[email protected]>

test

@@ -340,7 +340,7 @@ function e2e_pass {
 		USERTIMEOUT="${TIMEOUT}"
 	fi
 
-	go test -timeout "${USERTIMEOUT}" -v -cpu "${TEST_CPUS}" ${RUN_ARG}  "$@" "${REPO_PATH}/tests/e2e"
+	go test -timeout "${USERTIMEOUT}" -v ${RUN_ARG}  "$@" "${REPO_PATH}/tests/e2e"
 }
 
 function integration_e2e_pass {