TUN-8734: add log collection for kubernetes

## Summary
Adds the log collector for K8s based deployments.

Closes TUN-8734

diagnostic/log_collector_utils.go

@@ -0,0 +1,47 @@
+package diagnostic
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+)
+
+func PipeCommandOutputToFile(command *exec.Cmd, outputHandle *os.File) (*LogInformation, error) {
+	stdoutReader, err := command.StdoutPipe()
+	if err != nil {
+		return nil, fmt.Errorf(
+			"error retrieving output from command '%s': %w",
+			command.String(),
+			err,
+		)
+	}
+
+	if err := command.Start(); err != nil {
+		return nil, fmt.Errorf(
+			"error running command '%s': %w",
+			command.String(),
+			err,
+		)
+	}
+
+	_, err = io.Copy(outputHandle, stdoutReader)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"error copying output from %s to file %s: %w",
+			command.String(),
+			outputHandle.Name(),
+			err,
+		)
+	}
+
+	if err := command.Wait(); err != nil {
+		return nil, fmt.Errorf(
+			"error waiting from command '%s': %w",
+			command.String(),
+			err,
+		)
+	}
+
+	return NewLogInformation(outputHandle.Name(), true, false), nil
+}