Replace getLoadAverage() with getCpuLoad() for Windows compatibility

[shin19991207]

Replace getLoadAverage() with getCpuLoad() for Windows compatibility and update terminology to reflect recent load metrics

• use com.sun.management.OperatingSystemMXBean.getCpuLoad()
• update the content for all "the average system load" to "the recent system load"
• update SystemLoad.loadAverage to SystemLoad.recentLoad
• update test.yml and pom.xml to use java 17