Move miRNA_primary_transcript_region to pre_miRNA
Move miRNA_primary_transcript_region to pre_miRNA

Better term for our use and not as weird.

RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline