fix: revert: set rlimit explicitly in wrapperd

This reverts commit a2565f6.

The fix done in `a2565f67`, was actually a no-op caused by the
misunderstanding the fix done in Go and backported to [Go 1.20.4](golang/go@ecf7e00).
The fix gave a false confidence that it was working when it was tested
against Talos `main` branch since the PR #7190 bumped `x/sys` package
from [v0.7.0 -> v0.8.0](golang/go@ecf7e00), the actual change in `x/sys` can be found here at https://cs.opensource.google/go/x/sys/+/ff18efa0a3fa22d4fede381b822bbcfe53b7ee7c which meant that when updating Go to 1.20.4 the `x/sys` package should been updated too. The `x/sys` package changed how the syscall to set the rlimit was called, it got moved into the Go stdlib instead of calling rlimit syscall in the `x/sys` package, which meant a combination of using Go 1.20.4 and an older `x/sys` package means `RLIMIT_NOFILE` value would not be set back to the original value.

The Talos 1.4 release branch currently have  `x/sys`
at [v0.7.0(https://github.com/siderolabs/talos/blob/v1.4.3/go.mod#L133),
so the backport would consist of this change along another commit bumping `x/sys` package to `v0.8.0`.

Fixes: #7198
Fixes: #7206

Co-authored-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>
Signed-off-by: Noel Georgi <git@frezbo.dev>

hack/test/e2e.sh

@@ -126,6 +126,9 @@ function create_cluster_capi {
     ${KUBECTL} get nodes -l node-role.kubernetes.io/control-plane='' && :
     sleep 10
   done
+
+  # verify that RLIMIT_NOFILE is set to 1048576
+  ${KUBECTL} run --rm --restart=Never -it foo --image=alpine -- /bin/sh -c "ulimit -n" | grep -q 1048576
 }
 
 function run_talos_integration_test {

internal/app/wrapperd/main.go

@@ -50,13 +50,6 @@ func Main() {
 		}
 	}
 
-	// set the rlimit for the process before we drop privileges
-	// TODO: frezbo: see if we need to drop Rlimit from the boot sequence, the only downside maybe that some very early process might
-	// not have the higher rlimit set, but it seems we always use the wrapper to start processes.
-	if err := unix.Setrlimit(unix.RLIMIT_NOFILE, &unix.Rlimit{Max: 1048576, Cur: 1048576}); err != nil {
-		log.Fatalf("failed to set rlimit: %v", err)
-	}
-
 	// load the cgroup and put the process into the cgroup
 	if cgroupPath != "" {
 		if cgroups.Mode() == cgroups.Unified {