clean public header dependencies (#8725)

* remove io::ostream dependency from CString.h + clang tidy

* remove ostream.h dependency from Invocable.h

* remove Panic.h dependency from FixedCapacityVector.h

* remove ostream.h dependency from backend/ headers

* clang tidy Panic.h/Panic.cpp

libs/utils/src/FixedCapacityVectorBase.cpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <utils/FixedCapacityVector.h>
+#include <utils/compiler.h>
+#include <utils/Panic.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+
+namespace utils {
+
+void FixedCapacityVectorBase::capacityCheckFailed(size_t const capacity, size_t const size) {
+    UTILS_ASSUME(capacity < size);
+    FILAMENT_CHECK_PRECONDITION(capacity >= size)
+             << "capacity exceeded: requested size " << size
+             << "u, available capacity " << capacity << "u.";
+
+    // In practice, we will never reach this.
+    abort();
+}
+
+} // namespace utils