Change the error message to be shown when advancing a list but the germplasm does not have a preferred name.

GCP-9948

Reviewer: Daniel Villafuerte
Modified the namingConventionServiceImpl function getGermplasmRootName to use protected qualifier and change the message parameter being passed to the error message to be thrown by the application.  Also, added a setter for the message source so we can inject it via the JUnit test class.

GCP-9948

Reviewer: Daniel Villafuerte
Added an empty constructor to be used by the JUnit test class.

GCP-9948

Reviewer: Daniel Villafuerte
Added JUnit test class to test the getGermplasmRootName function of NamingConventionServiceImpl

GCP-9948

Reviewer: Daniel Villafuerte
Cleanup of code, move trailing comments and return the function call instead of assigning it to a variable

GCP-9948

Reviewer: Mae Turiana