Move reusable workflows to correct location

[AlanGreene]

Changes

Attempting to use the reusable workflows as they were results in the following error from GitHub Actions:

Invalid workflow file: .github/workflows/slash.yml#L8
invalid value workflow reference: references to workflows must be rooted in '.github/workflows'

Move the files to the correct location to resolve this error.

/cc @afrittoli
/kind misc

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[afrittoli]

Thanks @AlanGreene, I guess I implemented an hybrid between a reusable workflow and a composite action which wasn't neither one nor the other 🤦

I think reusable workflow is the right format for these, thanks for trying them out.

[afrittoli]

/lgtm

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