Avoid Groovy container detecting when there are .class files

Rather than code exceptions for specific files, such as
logback.groovy, ensure the Groovy container does not detect when there
are one or more .class files present.

[#61282032]
Avoid Spring Boot CLI container detecting shebang files with classes

[#61656448]
Merge 61282032-class-files-not-groovy to master

[Completes #61282032]