Feature/Updated validation to allow for missing sigma #3677

Job	Run time
Build sdist and set version	42s
build-cpp-test-linux (debug, gcc)	19m 14s
build-cpp-test-linux (debug, clang)	11m 49s
build-cpp-test-linux (release, gcc)	37m 9s
Build and test in Conda (ubuntu)	2m 44s
build-cpp-test-linux (release, clang)	18m 15s
build-cpp-test-macos (debug)	13m 46s
Build and test in Conda (windows)	6m 0s
build-cpp-test-macos (release)	18m 39s
build-cpp-test-windows (debug, msvc)	11m 51s
build-cpp-test-windows (debug, clang-cl)	16m 44s
build-cpp-test-windows (release, msvc)	18m 31s
build-cpp-test-windows (release, clang-cl)	19m 14s
build-and-test-python (linux-x64)	10m 23s
build-and-test-python (linux-aarch64)	35m 33s
build-and-test-python (macos)	11m 4s
build-and-test-python (windows)	13m 55s
test-python-macos-arm64	0s
publish-wheels	5s
	4h 25m 38s

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