Split pinned and unpinned base image pipelines.

[williamblevins]

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Change Description

Breakdown the base-images pipeline in pinned and unpinned to improve image registry structures and isolation.

Change Type

Select ONE:

• [ ] Documentation

• [ ] Stability bug fix

• [X] Other

• [ ] Other - special case

Testing Changes

Select ANY that apply:

• [ ] New Tests

• [ ] Existing Tests

• [ ] Test Framework

• [X] CI System

• [ ] Other

Consensus Changes

• [ ] Consensus Changes

API Changes

• [ ] API Changes

Documentation Additions

• [ ] Documentation Additions