Add TestReference for new ReadBias predictor

[mikecooke77]

Description

The bias has been added to the TestReference folder of the iasi file.

Dependencies

To be merged with the associated PR in ufo:

• [ ] https://github.com/JCSDA-internal/ufo/pull/3006

Impact

None.

Checklist

• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] I have run the unit tests before creating the PR

[BenjaminRuston]

@mikecooke77 why does this have the do not merge label we'd like to proceed with this and the companion PR: https://github.com/JCSDA-internal/ufo/pull/3006