[NFC] Make status test macros take ownership of iree_status_t. (#23276)

Adds `ConsumeForTest` overloads that wrap raw `iree_status_t` in
`iree::Status` RAII wrappers, ensuring automatic cleanup on test
failure. The macros `IREE_EXPECT_OK`, `IREE_ASSERT_OK`,
`IREE_EXPECT_STATUS_IS`, and `IREE_ASSERT_STATUS_IS` now consume the
status they test.

For lvalue status variables, the source is cleared to a code-only value
so any existing `iree_status_ignore`/`iree_status_free` calls become
harmless no-ops. This allows incremental migration without breaking
existing tests.

Most tests (outside of tokenizer) have been updated. tokenizer is being
reworked and the next feature branch merge will adopt this behavior.

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: benvanik

runtime/src/iree/base/allocator_test.cc

@@ -417,18 +417,18 @@ TEST(StructLayout, ZeroCountField) {
 
 TEST(StructLayout, OverflowOnMultiply) {
   iree_host_size_t total = 0;
-  iree_status_t status = IREE_STRUCT_LAYOUT(
-      0, &total, IREE_STRUCT_FIELD(SIZE_MAX, TestElement, NULL));
-  EXPECT_TRUE(iree_status_is_out_of_range(status));
-  iree_status_free(status);
+  IREE_EXPECT_STATUS_IS(
+      IREE_STATUS_OUT_OF_RANGE,
+      IREE_STRUCT_LAYOUT(0, &total,
+                         IREE_STRUCT_FIELD(SIZE_MAX, TestElement, NULL)));
 }
 
 TEST(StructLayout, OverflowOnAdd) {
   iree_host_size_t total = 0;
-  iree_status_t status = IREE_STRUCT_LAYOUT(
-      SIZE_MAX - 10, &total, IREE_STRUCT_FIELD(100, uint8_t, NULL));
-  EXPECT_TRUE(iree_status_is_out_of_range(status));
-  iree_status_free(status);
+  IREE_EXPECT_STATUS_IS(
+      IREE_STATUS_OUT_OF_RANGE,
+      IREE_STRUCT_LAYOUT(SIZE_MAX - 10, &total,
+                         IREE_STRUCT_FIELD(100, uint8_t, NULL)));
 }
 
 TEST(StructLayout, SingleField) {