Resolve "Since version 8.7.0-bb.0, an image that is not publicly available is in images.txt"

General MR

Summary

Removed reference to unused image registry1.dso.mil/bigbang-ci/gitlab-tester:0.0.4 in Chart.yaml and associated Dockerfile.

This will keep the old/unused image out of images.txt.

We actually use registry1.dso.mil/bigbang-ci/devops-tester:1.1.2. Since other packages don't publish that images with ther SBOM, Gitlab will also not publish that image.

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

For #309 (closed)

Upgrade Notices

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