refactor: unused `SameReference` concept removed #1831

Job	Run time
Generate build matrix for CMake Test Package CI	5s
Apple Clang 15 C++20 fmtlib gsl-lite Debug	55s
Apple Clang 15 C++20 fmtlib none Release	1m 4s
Clang-16 (x86-64) C++20 fmtlib gsl-lite Debug	1m 8s
Clang-16 (x86-64) C++20 fmtlib none Release	1m 2s
Clang-17 (x86-64) C++20 fmtlib none Debug	1m 22s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	1m 20s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	1m 21s
Clang-18 (arm64) C++23 fmtlib none Release	1m 6s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	1m 24s
Clang-18 (x86-64) C++23 std::format none Debug	1m 19s
GCC-12 C++20 fmtlib gsl-lite Debug	46s
GCC-12 C++20 fmtlib ms-gsl Release	41s
GCC-12 C++23 fmtlib ms-gsl Debug	56s
GCC-13 C++20 std::format gsl-lite Debug	39s
GCC-13 C++20 std::format none Release	37s
GCC-14 C++20 fmtlib none Release	41s
GCC-14 C++20 std::format gsl-lite Debug	34s
MSVC 14.4 C++20 fmtlib gsl-lite Debug	2m 2s
MSVC 14.4 C++20 std::format gsl-lite Debug	1m 29s
	20m 31s

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