Add new BB Base image

General MR

Summary

Add the new BB Base image with the latest tooling.

Related to https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/825

NOTE: I am leaving the old 8.4 version since that is still used by upgrade jobs across BB.

changed milestone to %1.26.0

added flux statusreview test-cirelease labels

assigned to @micah.nagel

mentioned in issue #825 (closed)

changed the description

approved this merge request

merged

mentioned in commit 4efd97e0