aj/verify poetry

[astuyve]

• feat: add poetry explicitly, test publish script in sandbox env
• fix: Include py before script
• feat: Ensure poetry is installed before publishing. Ensure CI_COMMIT_TAG present before publishing

What does this PR do?

Ensures poetry is installed before publishing.
Ensures CI_COMMIT_TAG is set before publishing.

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)