Hermetic builds -- use requirements.txt and remove poetry

[m-misiura]

Description

For the hermetic builds, requirements.txt file is needed; this is not straightforward with poetry as poetry export fails with e.g.

poetry export --only main --extras "sdd jailbreak openai nvidia tracing models" --format=requirements.txt --output=requirements.txt
Warning: poetry-plugin-export will not be installed by default in a future version of Poetry.
In order to avoid a breaking change and make your automation forward-compatible, please install poetry-plugin-export explicitly. See https://python-poetry.org/docs/plugins/#using-plugins for details on how to install a plugin.
To disable this warning run 'poetry config warnings.export false'.

Dependency walk failed at numpy (>=1.26.2)

Moreover, there is no details where dependencies are coming from

To generate requirements.txt I used uv instead which in my view yields a much more informative file as it shows a trace of where each dependency is coming from

uv pip compile pyproject.toml --extra sdd --extra jailbreak --extra openai --extra nvidia --extra tracing --extra models -o requirements.txt

Additionally, I removed the poetry usage from the Containerfile and just use pip

Test plan

Manually ran this demo using an image quay.io/rh-ee-mmisiura/nemo-guardrails:pip-models

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Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #15   +/-   ##
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  Coverage           ?   75.39%           
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  Files              ?      186           
  Lines              ?    18582           
  Branches           ?        0           
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  Hits               ?    14009           
  Misses             ?     4573           
  Partials           ?        0           

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