[mod] Revert changes made for Poetry 1.0.0b3 now fixed in b4:

- 'poetry run' no longer needs `--`.

Revert "[fix] Call 'poetry run silkaj' tests with '--'"
Revert "[fix] 'poetry run' cli parsing changed in 1.0.0b3:"

This reverts commit f335a2bd.
This reverts commit 4f772671.
9 jobs for dev in 4 minutes and 52 seconds (queued for 19 seconds)
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build

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poetry-56
tests-3.5

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poetry-78
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poetry-78
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  Coverage
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pages

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  Deploy
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