Allow `IsOkAndHolds` to rely on duck typing for matching `StatusOr` like types
instead of uniquely `absl::StatusOr`, e.g. `google::cloud::StatusOr`.

This is intended to support existing types that provide compliant `.ok()` and
`.status()`.  However support for types other than absl::StatusOr is not a
guaranteed feature and may be removed in the future

PiperOrigin-RevId: 828072487
Change-Id: I1ae696b41eecf6048bd7a4ae3d893648e57e81d1

absl/status/internal/status_matchers.h

diff --git a/absl/status/internal/status_matchers.h b/absl/status/internal/status_matchers.h
index 0750622..d11742b 100644
--- a/absl/status/internal/status_matchers.h
+++ b/absl/status/internal/status_matchers.h
@@ -69,8 +69,8 @@
   bool MatchAndExplain(
       StatusOrType actual_value,
       ::testing::MatchResultListener* result_listener) const override {
-    if (!GetStatus(actual_value).ok()) {
-      *result_listener << "which has status " << GetStatus(actual_value);
+    if (!actual_value.ok()) {
+      *result_listener << "which has status " << actual_value.status();
       return false;
     }