Add cosign container_tools module
Merge Request Description
This MR includes the modularized Cosign class from upload_to_harbor.py, making it available for use throughout the pipeline (ex. scan-logic stage).
Merge Request BOE
Risk
Harbor stage
Rollback Plan
Revert MR
Testing
Local & Staging Pipelines
Before: https://code-ib-mario.staging.dso.mil/dsop/redhat/ubi/ubi8/-/jobs/37164
After: https://code-ib-mario.staging.dso.mil/dsop/redhat/ubi/ubi8/-/jobs/37252
Closes #669 (closed)
Edited by Cody Miller