Alter ComponentAccumulator addPublicTool function to return the name of the tool being added.

Allows calls to addPublicTool and getPublicTool to be chained removing the need to refer to specific tool names in configuration functions.

Follows !60946 (merged) - new syntax used in ISF_MainConfig.py module.

Tagging @wlampl, @fwinkl, @tadej, @tstreble and @tbold for comments on the tweak to ComponentAccumulator.