Migrate to epochs: 1 in all configs

[thomasjpfan]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (Refactor)

Closes #1980

For this PR, I ran:

find . -name "*.yaml" -exec sed -i 's/^epochs: [0-9]/epochs: 1/' {} \;

Changelog

What are the changes made in this PR?

• Default all configs to epochs: 1

Test plan

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[pytorch-bot]

🔗 Helpful Links

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As of commit 4ca0338 with merge base e1caa9f ():
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[joecummings]

Thanks for picking this up so quickly!!