Various fusion bugfixes and improvements

[susannasiebert]

• Remove . between e and number in exon-specific fusion variant names. In order for this to take effect for existing fusions, we'll need to run something like Variants::FusionVariant.all.map{|v| v.name = v.generate_name; v.save} in the console after deploy
• Fusion MP name should be Feature name plus Variant name
• Fix bug in exon fusion coordinate background job - we'll need to rerun this background job for existing exon-specific fusion variants after backfilling the bookend exon coordinate transcript, build, and ensembl version (ETA: after be8ecc3 a backfill shouldn't be necessary anymore)
• Add VICC compliant name to variant popovers and variant cards