Remove usage of proc from BulkEsOperationService#execute method.

The following discussion from !208483 (merged) should be addressed:

• @minac started a discussion:

  I don't really know why we need to send a proc to the execute method 🤔

We don't need to accept a proc anymore in the BulkEsOperationService#execute method. This was an old way of handling updates to vulnerabilities before syncing to ES. We need to find all usages of BulkEsOperationService and remove the proc's usage and ultimately remove the proc from the Service itself.