fix(userspace/libsinsp): solve a bunch of bugs in the filter checks area #5863

Job	Run time
build-libs-emscripten 🧐	4m 20s
build-libs-linux-amd64 😁 (system_deps)	6m 24s
build-libs-linux-amd64-static 🎃	12m 50s
build-libs-linux-amd64 😁 (bundled_deps)	12m 47s
build-libs-linux-amd64 😁 (system_deps_minimal)	4m 36s
build-libs-linux-amd64 😁 (sanitizers)	12m 47s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	7m 0s
build-shared-libs-linux-amd64 🧐	4m 56s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	6m 17s
build-libs-linux-arm64 😁 (system_deps)	5m 55s
build-libs-others-amd64 😨 (macos-latest)	3m 48s
build-libs-linux-arm64 😁 (bundled_deps)	12m 22s
build-shared-libs-macos-amd64 😨	1m 46s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 14s
run-e2e-tests-amd64 (system_deps)	8m 42s
build-libs-linux-arm64 😁 (sanitizers)	12m 11s
run-e2e-tests-amd64 (bundled_deps)	13m 0s
test-libs-static (bundled_deps)	12m 57s
run-e2e-tests-amd64 (asan)	12m 58s
	2h 39m 50s

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