Create index synchronously with primary_identifier_id, vulnerability_id

What does this MR do and why?

Schedule creation of index index_vulnerability_occurrences_prim_iden_id_and_vuln_id for vulnerability_occurences table Adding the following index will bring down the execution cost

create index on vulnerability_occurrences(primary_identifier_id, vulnerability_id)

Index was created asynchronously in 131647

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