refector operation service

Conflicts:
	bpm/bonita-core/bonita-operation/bonita-operation-api-impl/src/main/java/org/bonitasoft/engine/core/operation/impl/OperationServiceImpl.java
refactor operation service - remove unused execute methode

Conflicts:
	bpm/bonita-core/bonita-operation/bonita-operation-api-impl/src/main/java/org/bonitasoft/engine/core/operation/impl/OperationServiceImpl.java
BS-7995, execute operation in batch, and not one by one
BS-7995, refactor OperationServiceImpl, move dedicated code to OperationExecutorStrategyProvider

Conflicts:
	bpm/bonita-core/bonita-operation/bonita-operation-api-impl/src/main/java/org/bonitasoft/engine/core/operation/impl/OperationServiceImpl.java