Makefile+scripts: add unit test flake hunter

This commit adds a script to hunt flakes for a specific unit test with
trace logs. Also rename the make commands to make them more clear on
whether it's a unit test, itest, or paralleled itest.

scripts/unit-test-flake-hunter.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Check if pkg and case variables are provided.
+if [ $# -lt 2 ] || [ $# -gt 3 ]; then
+	echo "Usage: $0 <pkg> <case> [timeout]"
+	exit 1
+fi
+
+pkg=$1
+case=$2
+timeout=${3:-30s} # Default to 30s if not provided.
+
+counter=0
+
+# Run the command in a loop until it fails.
+while output=$(go clean -testcache && make unit-debug log="stdlog trace" pkg=$pkg case=$case timeout=$timeout 2>&1); do
+	((counter++))
+	echo "Test $case passed, count: $counter"
+done
+
+# Only log the output when it fails.
+echo "Test $case failed. Output:"
+echo "$output"