fix(ci): support Cargo 1.100 artifact layout in cleanup fixture (#5010)

Cargo 1.100 moves intermediate compiler artifacts into per-unit build
directories and emits `build_script_build` instead of
`build-script-build`. The unlocked-build fixture currently fails on its
old rlib path before the SDK build starts, even though the library
survives cleanup.

Discover compiler inputs recursively and accept both build-script names
while preserving the library, generated-input, ordinary-executable,
discarded-test, linker-failure and outside-target assertions. The
standalone fixture reproduces the failure before this change and passes
afterward on Rust/Cargo 1.100.0; it also passes on 1.97.0. Fault
injection confirms missing libraries and other retained inputs still
fail their assertions. Production cleanup and normal workflow coverage
are unchanged.

ci/tests/test_build_no_lock.py

@@ -88,9 +88,11 @@ class BuildNoLockTest(unittest.TestCase):
             self.assertTrue((target / "fixture_cli").is_file())
             # Cargo guarantees this binary for test execution, not compile-time reads.
             subprocess.run([str(target / "fixture_cli")], check=True)
-            self.assertTrue(list((target / "deps").glob("libartifact_fixture*.rlib")))
-            self.assertTrue(list((target / "build").glob("*/build-script-build")))
-            self.assertTrue(list((target / "build").glob("*/out/generated.rs")))
+            # Cargo 1.100 nests compiler inputs in per-unit build directories and
+            # names the build-script executable build_script_build.
+            self.assertTrue(list(target.rglob("libartifact_fixture*.rlib")))
+            self.assertTrue(list((target / "build").rglob("build[-_]script[-_]build")))
+            self.assertTrue(list((target / "build").rglob("out/generated.rs")))
 
     def test_link_failure_preserves_cargo_status_and_diagnostic(self):
         with tempfile.TemporaryDirectory(prefix=".no-lock-", dir=SCRIPT.parent) as temp: