Remove code for Excel interpretation reports
Today the ELLA backup solution is Excel - the https://gitlab.com/alleles/anno-targets/-/blob/dev/targets/_excel_reports is shipped together with analysis data and contains the variants in albeit simplified filtering version. The filtering does not match the sophisticated rules in ELLA.
After verifying with users that this is never got used (not even when ELLA was down), we performed and got approved the Risk analysis for removing this code in anno. Instead a proper solution will be a standalone ELLA executable - the work that can be prioritised on demand.
Work here: remove _excel_reports and code elsewhere connected to those (tests?)