[tests] remove `test_pipelines_common.py` (#14669)
* migrate imports
* migrate stable diffusion adapter tests
* up
* move last remaining bits.
* simplify test policy wording
* move around
* move flux ip adapter testing stuff to flux module of test
* fix(ci): harden GitHub Actions workflows (#14669) (#14787)
fix(ci): harden workflow files flagged on #14669
Co-authored-by: hf-security-analysis[bot] <265538906+hf-security-analysis[bot]@users.noreply.github.com>
* clarify comment.
* remove name from batch_input
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Co-authored-by: hf-security-analysis[bot] <265538906+hf-security-analysis[bot]@users.noreply.github.com>
