test: Add coverage for IsolatedStoreImpl::find* (#7043)
test: Add coverage for IsolatedStoreImpl::find* (#7043)

* Add test coverage for find* methods in IsolatedStoreImpl

Signed-off-by: Ashley Hedberg <556b7be5ddd3c7c37da2ae2c8e6fdc1b5f832349@google.com>

lizan/envoy,envoyproxy/envoy,istio/envoy,istio/envoy,jrajahalme/envoy,istio/envoy,istio/envoy,lyft/envoy,lyft/envoy,jrajahalme/envoy,istio/envoy,lyft/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,eklitzke/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lizan/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lizan/envoy,eklitzke/envoy,envoyproxy/envoy,jrajahalme/envoy,lyft/envoy,envoyproxy/envoy,lizan/envoy,envoyproxy/envoy-wasm,lizan/envoy,jrajahalme/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,jrajahalme/envoy,lizan/envoy