Rework Vector_softRemove() and compact() operations #5364

Job	Run time
build-unsupported-latest-gcc	28s
build-ubuntu-latest-full-featured-clang	3m 14s
build-ubuntu-latest-clang-sanitizer	2m 49s
build-ubuntu-latest-minimal-clang	2m 29s
build-ubuntu-latest-clang-analyzer	2m 18s
build-ubuntu-latest-minimal-gcc	41s
build-dragonflybsd-latest-gcc	2m 32s
build-freebsd-latest-clang	2m 9s
build-macos-latest-clang	1m 7s
build-ubuntu-latest-gcc-static	1m 3s
build-ubuntu-latest-full-featured-gcc	1m 4s
build-ubuntu-latest-pcp	43s
build-openbsd-latest-clang	2m 38s
lint-whitespace	5s
lint-pcp-config	4s
build-solaris-latest-gcc	3m 53s
build-netbsd-latest-gcc	4m 32s
	31m 49s

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