Add a cwasm produced during testing to .gitignore (#11421)

* Add a cwasm produced during testing to `.gitignore`

Added in wasip3-prototyping but never made its way upstream here, so
doing so now.

* Ignore all cwasms in gitignore

Author: alexcrichton

.gitignore

@@ -26,8 +26,7 @@ examples/.cache
 *.smt2
 cranelift/isle/veri/veri_engine/test_output
 crates/explorer/node_modules
-tests/all/pulley_provenance_test.cwasm
-tests/all/pulley_provenance_test_component.cwasm
+*.cwasm
 /artifacts
 testcase*.wat
 testcase*.wasm