Remove the tmp_idx_vulnerabilities_on_id_where_report_type_7_99 index

The following discussion from !98907 (merged) should be addressed:

• @mayra-cabrera started a discussion:

  Could we please create a follow-up to remove this temporary index?

Implementation plan

• backend create the migration to remove the tmp_idx_vulnerabilities_on_id_where_report_type_7_99 index