[ntuple] Fixes and cleanups for `RRecordField` and subclasses #13040

Job	Run time
Windows 10 x64 Release	1h 30m 39s
Windows 10 x86 Release	1h 32m 50s
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	22m 53s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	27m 17s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	27m 22s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	34m 3s
Upload Event Payload	2s
alma8 LLVM_ENABLE_ASSERTIONS=On	37m 0s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	55m 12s
ubuntu20 LLVM_ENABLE_ASSERTIONS=On	39m 55s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 22m 12s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 46m 26s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	25m 36s
alma9 modules_off runtime_cxxmodules=Off	21m 11s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	23m 33s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo, ccache=ON	35m 38s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	42m 15s
ubuntu2404-cuda gpu	57m 44s
	13h 41m 49s

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