[ntuple] Fixes and cleanups for `RRecordField` and subclasses #13049

Job	Run time
Windows 10 x64 Release	1h 34m 12s
Windows 10 x86 Release	1h 42m 35s
Upload Event Payload	2s
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	19m 26s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	53m 58s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	44m 25s
alma8 LLVM_ENABLE_ASSERTIONS=On	40m 10s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	21m 25s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 21m 30s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	26m 26s
ubuntu20 LLVM_ENABLE_ASSERTIONS=On	28m 14s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 33m 20s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 8m 57s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	29m 47s
alma9 modules_off runtime_cxxmodules=Off	30m 12s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	24m 47s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo, ccache=ON	34m 19s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	38m 2s
ubuntu2404-cuda gpu	30m 44s
	14h 22m 31s

Provide feedback