[smart_holder] Configure only one job per OS kind to build and run tests with -DPYBIND11_USE_SMART_HOLDER_AS_DEFAULT
#5307
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Description
Follow-on to PR #5257, which made it far less important to build and run all tests with
py::smart_holder
as the default holder.Remove ci_sh_def.yml
Piggy-backed: Add
smart_holder
tobranches
in emscripten.yamlSuggested changelog entry: