update(libsinsp/tests): add test for string filter formats #7229

Job	Run time
build-libs-linux-amd64-static 🎃	22m 32s
build-libs-linux-amd64 😁 (system_deps)	6m 59s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	5m 54s
build-shared-libs-linux-amd64 🧐	5m 36s
build-libs-linux-amd64 😁 (bundled_deps)	16m 44s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	5m 8s
build-libs-linux-amd64 😁 (system_deps_minimal)	5m 22s
build-libs-others-amd64 😨 (macos-latest)	3m 20s
build-libs-linux-amd64 😁 (sanitizers)	15m 8s
build-libs-linux-amd64 😁 (zig)	51s
build-libs-emscripten 🧐	6m 21s
build-shared-libs-macos-amd64 😨	1m 10s
build-libs-linux-arm64 😁 (system_deps)	11m 4s
build-libs-linux-arm64 😁 (bundled_deps)	31m 20s
build-libs-linux-arm64 😁 (system_deps_minimal)	8m 54s
run-e2e-tests-amd64 (system_deps)	8m 46s
test-libs-static (bundled_deps)	14m 46s
build-libs-linux-arm64 😁 (sanitizers)	32m 44s
run-e2e-tests-amd64 (bundled_deps)	18m 48s
build-libs-linux-arm64 😁 (zig)	49s
run-e2e-tests-amd64 (asan)	20m 33s
	4h 2m 49s

Provide feedback