generation of sboms w/multiprocess

Description

Instead of sequential sbom creation, this MR proposes we do them in parallel, saving some time.

Risk

post-build stage breaks.

Rollback Plan

revert this MR or roll forward with changes to fix.

Testing

Tested in Zelda. With a 5G container and an UBI 8. Reduces stage runtime by approximately 50%.

There is also some superfluous 'caplog' arguments passed into our tests, which have been removed.