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Add FindLast and FindLastIf to contrib/algo #18624

Job	Run time
bazel	21m 15s
Build and test Clang-22 (C++23)	1h 21m 24s
Build and test Clang-22	52m 7s
Build and test GCC-16	1h 15m 26s
Build and test Clang-12	24m 46s
Build and test GCC-12 (x86_32)	13m 50s
Build and test Clang-21 (VQSort disabled)	38m 40s
Build and test GCC-16 (C++23)	1h 22m 55s
Build and test GCC-12 (C++11)	36m 23s
Build and test GCC-10	21m 22s
Build and test Clang-15 (C++20)	26m 43s
Build and test ${{ matrix.name }}	0s
Build and test ${{ matrix.name }}	0s
Build and test ${{ matrix.name }}	0s
	7h 54m 51s