use `conda_install_tool: pixi` in staged-recipes?

I assume that there are time-efficiency gains on the table (ref. https://github.com/conda-forge/conda-forge.github.io/issues/2323#issuecomment-2392153849). Thoughts? Maybe we would want to just jump straight to flipping the default in conda-smithy? https://github.com/conda-forge/conda-smithy/blob/1d1dd76eafa849ead0d274e4acf824a217ba26a3/conda_smithy/schema.py#L515-L517 cc @jaimergp @beckermr from involvement in https://github.com/conda-forge/conda-smithy/pull/2075