Fixes ORF1a being called as sgRNA and updates tests for ont and illumina

[mbdabrowska1]

• Fixes bug assigning ORF1a to sgRNA, now ORF1a assigned to gRNA
• Fixes multiple bugs in the ont and illumina search_for_sgRNA tests
• Updates ont and illumina tests to check for correct ORF1a assignment

[mbdabrowska1]

• [x] Test if the pipeline works correctly on full ont dataset
• [x] Test if the pipeline works correctly on full illumina dataset