ensure that we have an import_std configuration in the test-set #1938

Job	Run time
Generate build matrix for Conan CI	4s
fmtlib gsl-lite C++20 Apple Clang 15 Debug	6h 0m 19s
fmtlib none C++23 Apple Clang 15 Debug	6h 0m 21s
fmtlib gsl-lite C++20 Clang-16 (x86-64) Debug	8m 19s
fmtlib ms-gsl C++20 Clang-16 (x86-64) Release	9m 11s
std::format gsl-lite C++20 Clang-17 (x86-64) Debug	9m 37s
std::format ms-gsl C++23 Clang-17 (x86-64) Debug	10m 54s
std::format gsl-lite C++20 Clang-18 (arm64) Debug	4m 10s
std::format ms-gsl C++23 Clang-18 (arm64) Release	6m 21s
std::format gsl-lite C++20 Clang-18 (x86-64) Debug	9m 41s
std::format none C++20 Clang-18 (x86-64) Debug	11m 5s
std::format none C++20 Clang-18 (x86-64) Release	10m 23s
std::format none C++23 Clang-18 (x86-64) Release	8m 37s
fmtlib gsl-lite C++20 GCC-12 Debug	4m 52s
fmtlib none C++20 GCC-12 Debug	5m 10s
std::format gsl-lite C++20 GCC-13 Debug	6m 21s
std::format none C++23 GCC-13 Debug	6m 1s
std::format gsl-lite C++20 GCC-14 Debug	5m 27s
fmtlib none C++23 GCC-14 Release	5m 11s
std::format gsl-lite C++20 MSVC 14.4 Debug	1m 45s
std::format ms-gsl C++23 MSVC 14.4 Debug	2m 11s
Promote Conan package	0s
	14h 6m 0s

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