gdb_main: refactor noackmode zombie state handling #812

Job	Run time
build-macos (macos-13)	38s
build-mingw (windows-2022, ucrt64)	2m 9s
build-macos (macos-14)	27s
build-linux (ubuntu-22.04, jammy, clang-13)	35s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, 96b_carbon)	28s
build-linux (ubuntu-22.04, jammy, clang-18)	42s
build-linux (ubuntu-22.04, jammy, gcc-11)	35s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f401cc)	32s
build-linux (ubuntu-22.04, jammy, gcc-13)	50s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f401ce)	36s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f411ce)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, bluepill)	28s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, ctxlink)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f072)	33s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f3)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f4discovery)	25s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, hydrabus)	27s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, launchpad-icdi)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native)	34s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-uncommon)	24s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-st-clones)	29s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-riscv)	31s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-remote)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlink)	29s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlinkv3)	29s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, swlink)	34s
package-firmware	3s
	15m 14s

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