test(ocsf): validate OCSF events with openshell-ocsf-validate

Replace openshell-ocsf's hand-written schema walker with
openshell-ocsf-validate in the builder, producer, gateway audit and
Podman e2e tests. One validate_event call now covers what the
per-object validate_required_fields, validate_known_fields and
validate_enum_value calls checked, and adds type checks and enum
checks for every attribute.

Remove the validation module and the vendored OCSF object and class
schemas from openshell-ocsf. The e2e suite no longer depends on
openshell-ocsf directly.

Signed-off-by: Kris Hicks <khicks@nvidia.com>

Author: krishicks

Cargo.lock

@@ -11,7 +11,7 @@ license.workspace = true
 repository.workspace = true
 
 [features]
-# Share vendored-schema assertions with producer regression tests.
+# Share OCSF event capture and a sandbox test context with producer tests.
 test-support = []
 
 [dependencies]
@@ -24,6 +24,7 @@ uuid = { workspace = true }
 tracing-subscriber = { workspace = true }
 
 [dev-dependencies]
+openshell-ocsf-validate = { path = "../openshell-ocsf-validate" }
 tracing-subscriber = { workspace = true, features = ["env-filter", "json"] }
 
 [lints]