fix(client): update icmp/ping logic to determine pinger privileged mode (#1346)

* fix(pinger): update logic to determine pinger privileged mode

* add some unit tests for pinger

Signed-off-by: Zee Aslam <zeet6613@gmail.com>

* undo accidental removal

Signed-off-by: Zee Aslam <zeet6613@gmail.com>

* check for cap_net_raw by trying to open a raw socket and checking for permission error

Signed-off-by: Zee Aslam <zeet6613@gmail.com>

* revert syscall after testing. It is unable to build a binary on windows

Signed-off-by: Zee Aslam <zeet6613@gmail.com>

* remove extra import

* review icmp section of readme. No changes required

Signed-off-by: Zee Aslam <zeet6613@gmail.com>

* Update client/client.go

Co-authored-by: TwiN <twin@linux.com>

* Update client/client.go

Match function name

Co-authored-by: TwiN <twin@linux.com>

* Update client/client.go

Remove extra line

Co-authored-by: TwiN <twin@linux.com>

---------

Signed-off-by: Zee Aslam <zeet6613@gmail.com>
Co-authored-by: TwiN <twin@linux.com>

client/client_test.go

@@ -6,6 +6,8 @@ import (
 	"io"
 	"net/http"
 	"net/netip"
+	"os"
+	"runtime"
 	"testing"
 	"time"
 
@@ -129,6 +131,33 @@ func TestPing(t *testing.T) {
 	}
 }
 
+func TestShouldRunPingerAsPrivileged(t *testing.T) {
+	// Don't run in parallel since we're testing system-dependent behavior
+	if runtime.GOOS == "windows" {
+		result := ShouldRunPingerAsPrivileged()
+		if !result {
+			t.Error("On Windows, ShouldRunPingerAsPrivileged() should return true")
+		}
+		return
+	}
+
+	// Non-Windows tests
+	result := ShouldRunPingerAsPrivileged()
+	isRoot := os.Geteuid() == 0
+
+	// Test cases based on current environment
+	if isRoot {
+		if !result {
+			t.Error("When running as root, ShouldRunPingerAsPrivileged() should return true")
+		}
+	} else {
+		// When not root, the result depends on raw socket creation
+		// We can at least verify the function runs without panic
+		t.Logf("Non-root privileged result: %v", result)
+	}
+}
+
+
 func TestCanPerformStartTLS(t *testing.T) {
 	type args struct {
 		address     string