lib/filterx: add e2e test for proper LogMsg -> FilterX changes sync #99

Job	Run time
create-source-tarball	1m 49s
create-packages / almalinux-8	3m 47s
create-packages / almalinux-9	6m 29s
create-packages / debian-bookworm	5m 50s
create-packages / debian-testing	5m 45s
create-packages / fedora-41	1m 28s
create-packages / ubuntu-noble	8m 12s
	33m 20s

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