Remove mangle_callback, server_mode flags, and PluginFailureInfo #90

Job	Run time
create-source-tarball	1m 46s
create-packages / almalinux-8	5m 39s
create-packages / debian-bookworm	6m 27s
create-packages / debian-testing	6m 10s
create-packages / fedora-39	7m 1s
create-packages / ubuntu-noble	9m 7s
	36m 10s

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