update buildkite to new-central

[odunbar]

Purpose

Closes #289

Content

• updates to buildkite pipeline.yml to run pipelines consistent with ClimaModules standards

---

• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.26%. Comparing base (a621a04) to head (b9894f4).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   88.09%   88.26%   +0.16%     
==========================================
  Files           7        8       +1     
  Lines        1134     1184      +50     
==========================================
+ Hits          999     1045      +46     
- Misses        135      139       +4     

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[odunbar]

no buildkite issues so merging without review.