Integrated Pipeline: renamed FileTree test data builder

...ab/integrated_pipeline_tests/ArchiveCleanUpFlowSpec.scala

.../integrated_pipeline_tests/ArchiveUnpackingFlowSpec.scala

...ala/eu/nomad_lab/integrated_pipeline_tests/Builders.scala

...egrated_pipeline_tests/CalculationParsingEngineSpec.scala

...eu/nomad_lab/integrated_pipeline_tests/FileTreeSpec.scala

..._pipeline_tests/ParsingResultsProcessingManagerSpec.scala

...nomad_lab/integrated_pipeline_tests/TreeScannerSpec.scala

...ipeline_tests/WriteToHDF5MergedResultsProcessorSpec.scala

...ated_pipeline_tests/WriteToHDF5ResultsProcessorSpec.scala

...ated_pipeline_tests/WriteToJsonResultsProcessorSpec.scala