Step names must be unique #3757

[FBibonne]

• test(check unicity of job name in a flow) failing test
• test(check unicity of job name in a flow) step name as a job parameter
• fix(log for tests) print log in console for tests
• feat(step name unicity) #3757 the names of different steps in a job must be different

[FBibonne]

Solves #3757

[FBibonne]

WIP because 5 tests still fail

[FBibonne]

All tests passed.

• pom is updated to have a have a version of slf4j-api corresponding to simple-slf4j
• unicity of names is checked when starting the job , just before calling listeners because step names may be known only in JobScope
• in FlowJob.findStepsThrowingIfNameNotUnique, I suggest to remove the else block when state is instance of StepHolder : it is never executed