longrun builkdite: fix dt for mhs; add mo test for mhs

[jiahe23]

PULL REQUEST

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[jiahe23]

bors try

[bors]

try

Build failed:

• buildkite/climaatmos-ci

[jiahe23]

bors try

[jiahe23]

bors try-

[jiahe23]

bors r+

[bors]

Build succeeded:

• buildkite/climaatmos-ci
• docbuild
• format