Revert "[rbrowser] Make fCleanupHandle a pointer to TObject" #13804

Job	Run time
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	27m 23s
Windows 10 x64 Release	58m 37s
Upload Event Payload	42s
Windows 10 x86 Release	1h 45m 36s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	57m 33s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	39m 58s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	38m 59s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	54m 12s
fedora41 LLVM_ENABLE_ASSERTIONS=On	1h 9m 43s
alma8 LLVM_ENABLE_ASSERTIONS=On	1h 10m 42s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 6m 41s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 18m 11s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 17m 55s
ubuntu2410 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 13m 6s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 25m 41s
alma9 modules_off runtime_cxxmodules=Off	1h 7m 56s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	1h 10m 52s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo	37m 42s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	1h 0m 42s
	22h 2m 11s

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