Retrieve secrets from Vault, fix test-provider CI

[iameskild]

Reference Issues or PRs

What does this implement/fix?

This PR uses Vault to pull in the necessary secrets that are needed for CI to work, specifically the test-provider workflow.
Relies on this PR to handle creating the cloud-specific service-accounts.

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe): update where we pull cloud secrets from

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

[iameskild]

Ignore most of these commits... I was using this branch as the base branch when testing changes to the integration tests.

[viniciusdc]

I will re-run the tests again just to make sure they are still working, and if the test_providers passes then we are ready to merge

[viniciusdc]

Relevant tests are passing, which leads to the conclusion that access to secrets and propagation are respected accordingly.