PDF: const-qualify scalar by-value constructor params #2748

Job	Run time
build-test-downstream (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	13m 47s
build (macos-26, macos-26-armv8-clang-14, macos-26-armv8-clang-14)	15m 50s
build (macos-15, macos-15-armv8-clang-14, macos-15-armv8-clang-14)	13m 41s
build (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	19m 45s
build (windows-2022, windows-2022-msvc-1940, windows-2022-msvc-1940)	5m 20s
build (ubuntu-24.04, ubuntu-24.04-clang-18, android-35-x86_64, 28.1.13356709)	17m 3s
build (ubuntu-24.04, ubuntu-24.04-gcc-14, ubuntu-24.04-gcc-14)	7m 35s
docker (ubuntu-24.04, ubuntu-24.04-clang-18)	25s
test (macos-26, macos-26-armv8-clang-14)	9m 50s
	1h 43m 16s

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