remove solr heap setting script as it can be done via env in 6.3
remove solr heap setting script as it can be done via env in 6.3

EBIBioSamples/biosamples-v4,EBIBioSamples/biosamples-v4,EBIBioSamples/biosamples-v4,EBIBioSamples/biosamples-v4