Lean defaults: turn legacy engines/transports off by default #8585

Job	Run time
git_checks	9s
format	32s
el8 (el8, oneapi, mpich)	16m 24s
docker (ubuntu-bionic)	7m 35s
el8 (el8, icc, mpich)	28m 12s
windows (win2025, shared, msmpi)	19m 58s
macos (macos-14, xcode15_4, arm64, shared, serial)	8m 31s
windows (win2025, static, serial, windows-2025, vs2026)	15m 26s
macos (macos-15, xcode16_4, arm64, static, serial)	6m 49s
macos (macos-14, xcode15_4, arm64, static, serial)	6m 1s
windows (win2025, serial, windows-2025, vs2026)	15m 38s
windows (win2022, shared, msmpi)	17m 44s
CodeQL (cpp)	32m 57s
ubuntu (ubuntu22.04, gcc9, mpich)	4m 4s
macos (macos-15, xcode16_4, arm64, shared, serial)	8m 15s
ubuntu (ubuntu22.04, gcc9, serial)	10m 31s
ubuntu (ubuntu22.04, clang14, mpich)	15m 37s
ubuntu (ubuntu22.04, gcc9, ompi)	23m 38s
ubuntu (ubuntu22.04, gcc10, mpich)	16m 23s
ubuntu (ubuntu22.04, clang11, mpich)	4m 39s
ubuntu (ubuntu22.04, clang11, serial)	9m 45s
ubuntu (ubuntu22.04, gcc11, serial, ubuntu-22.04-arm, aarch64)	6m 12s
ubuntu (ubuntu22.04, clang11, ompi)	17m 5s
ubuntu (ubuntu22.04, gcc9, serial, static)	6m 20s
ubuntu (ubuntu22.04, gcc11, mpich)	16m 27s
ubuntu (ubuntu22.04, rocm, serial, build_only)	3m 22s
ubuntu (ubuntu22.04, gcc12, mpich, internal)	25m 43s
ubuntu (ubuntu22.04, gcc12, mpich, external)	13m 44s
contract (tau)	10m 44s
contract (lammps)	4m 1s
contract (examples)	2m 12s
build_and_test	4s
	6h 14m 42s

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