Refactored for standardizing content and copy handling for Multipart … #2365

Job	Run time
clang-tidy	7m 7s
clang-tidy	7m 7s
macos-13	1m 21s
macos-13	17m 41s
MemoryTest (glibc_debug)	12m 26s
MemoryTest (glibc_debug)	12m 26s
Linux (ubuntu:24.10)	12m 15s
Linux (ubuntu:24.10)	12m 15s
MemoryTest (sanitize_address)	14m 1s
MemoryTest (sanitize_address)	14m 1s
Linux (ubuntu:24.04)	12m 26s
Linux (ubuntu:24.04)	12m 26s
MemoryTest (sanitize_others)	13m 4s
MemoryTest (sanitize_others)	13m 4s
Linux (ubuntu:22.04)	12m 44s
Linux (ubuntu:22.04)	12m 44s
MemoryTest (sanitize_thread)	14m 41s
MemoryTest (sanitize_thread)	14m 41s
Linux (ubuntu:20.04)	12m 39s
Linux (ubuntu:20.04)	12m 39s
MemoryTest (thread_safety)	13m 8s
MemoryTest (thread_safety)	13m 8s
Linux (debian:bookworm)	12m 45s
Linux (debian:bookworm)	12m 45s
MemoryTest (valgrind)	22m 17s
MemoryTest (valgrind)	22m 17s
Linux (debian:bullseye)	11m 47s
Linux (debian:bullseye)	11m 47s
Linux (rockylinux:9)	13m 6s
Linux (rockylinux:9)	13m 6s
Linux (rockylinux:8)	12m 34s
Linux (rockylinux:8)	12m 34s
Linux (fedora:41)	12m 4s
Linux (fedora:41)	12m 4s
Linux (fedora:40)	12m 50s
Linux (fedora:40)	12m 50s
Linux (opensuse/leap:15)	13m 14s
Linux (opensuse/leap:15)	13m 14s
Linux (alpine:3.20)	13m 41s
Linux (alpine:3.20)	13m 41s
	8h 36m 40s

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