Deprecate `GTSAM_SLOW_BUT_CORRECT_EXPMAP` #3755

Job	Run time
check-paths	4s
ubuntu-20.04-gcc-9 Release Python 3	18m 52s
ubuntu-20.04-clang-9 Release Python 3	17m 21s
macos-13-xcode-14.2 Release Python 3	17m 57s
macos-14-xcode-15.4 Release Python 3	9m 41s
windows-2022-msbuild Release Python 3	31m 37s
	1h 35m 32s

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