Use the JLogEntry class

[laoneo]

Pull Request for Issue #16315 and #16311.

Summary of Changes

class_alias is actually not loading the alias class. Additionally when you have typed function arguments and instanceof calls, the class is also not loaded. Because the logger is called very early it can lead to a situation that the class JLogEntryis not loaded but a logger which is not namespaced requires still JLogEntry and then we get an error like:
Argument 1 passed to PlgSystemDebug::logger() must be an instance of JLogEntry, instance of Joomla\CMS\Log\LogEntry given

This pr is a workaround to use JLogEntryinstead of the namespaced class.

Testing Instructions

• Enable debugging in Joomla configuration
• Enable in the debug plugin Logging
  

Expected result

No Error is thrown.

Actual result

Error is thrown.

[wilsonge]

This is bullshit. But I dunno what's better