start using `uv --script` or `uv tool` in openapi generators

[pcrespov]

Thought: we should start using uv --script or uv tool

_Originally posted by @sanderegg in https://github.com/ITISFoundation/osparc-simcore/pull/6787#discussion_r1853422819_

• @sanderegg demoed how using uv init we can add intra-repo relative dependencies. This in combination with https://docs.astral.sh/uv/guides/scripts/#declaring-script-dependencies