ensure that we have an import_std configuration in the test-set #1970

Job	Run time
Generate build matrix for Conan CI	3s
Apple Clang 15 C++20 fmtlib gsl-lite Debug	9m 27s
Clang-16 (x86-64) C++20 fmtlib gsl-lite Debug	5m 30s
GCC-12 C++20 fmtlib gsl-lite Debug	4m 44s
GCC-13 C++20 fmtlib ms-gsl Debug	5m 14s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	6m 4s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	2m 38s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	5m 57s
GCC-13 C++20 std::format gsl-lite Debug	3m 57s
GCC-14 C++20 std::format gsl-lite Debug	3m 31s
MSVC 14.4 C++20 std::format gsl-lite Debug	1m 48s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	6m 38s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	2m 59s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	6m 55s
Clang-18 (x86-64) C++23 std::format none Release	4m 54s
Promote Conan package	1s
	1h 10m 20s

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