[CI Sprint] Quantization CI Cleanup

[killershrimp]

Purpose

Reduce quantization CI time (#23669 (comment))

• Use smaller models when possible
• Small optimizations like --enforce-eager, generate less tokens...

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[robertgshaw2-redhat]

I would propose we just have one test here. CPU weight offloading is a niche feature so I think testing so many quant frameworks is overkill. Let's just use the compressed-tensors models since that is "vendored" by vLLM