Support subPath for rewriting Git repo reference

[trisberg]

All accelerators except hungryman and spring-smtp-gateway are updated to use the tap-workload fragment. The excluded two are multi-module projects which require usage of subPath property. This property currently isn't supported.

We should either support this in the tap-workload fragment or create a new fragment that supports modifying the subPath removing the first level of the path - subPath: hungryman/hungryman-search -> subPath: hungryman-search