There's possibility that some installations might add more into
Path that doesn't get visible during the installation process.
Change makes it easier to detect if there's i.e. JRE installed during
Mimer, which caused Java SE update to 17 fail in qtbase build for
Android, because JRE was the first Java found from Path and it
wasn't the required new JDK 17 version.
This can lead even to test with incorrect version of Java, which can
happen with any other different version installations as well.
Task-number: QTQAINFRA-6392
Task-number: QTQAINFRA-6385
Pick-to: 6.8
Change-Id: Idce79eb06d73894ae648e0be53ff1f07bb21392d
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>
