Change in example_samples_with_parents.tsv sample identifiers because project-samples feature is by default true

SSDM-7190: Moving 'core-plugins/datasource' of git repository 'OpenbisSyn' to core-plugins of openbis_standard_technology and rename it to 'openbis-sync'. Link to plugin script is provided for all property assignments

SSDM-7171: column 'number of entities' added if property count-all-entities = true. New unit test added.