Delete debug_string library. Prefer the CelValue.DebugString() method.

PiperOrigin-RevId: 377318595

Author: CEL Dev Team

eval/public/testing/BUILD

@@ -5,48 +5,11 @@ package(
 
 licenses(["notice"])  # Apache 2.0
 
-cc_library(
-    name = "debug_string",
-    srcs = ["debug_string.cc"],
-    hdrs = ["debug_string.h"],
-    deps = [
-        "//eval/public:cel_attribute",
-        "//eval/public:cel_value",
-        "//eval/public:unknown_function_result_set",
-        "//eval/public:unknown_set",
-        "@com_google_absl//absl/strings",
-        "@com_google_absl//absl/strings:str_format",
-        "@com_google_absl//absl/time",
-        "@com_google_protobuf//:protobuf",
-    ],
-)
-
-cc_test(
-    name = "debug_string_test",
-    srcs = ["debug_string_test.cc"],
-    deps = [
-        ":debug_string",
-        "//eval/public:cel_attribute",
-        "//eval/public:cel_function",
-        "//eval/public:cel_value",
-        "//eval/public:unknown_attribute_set",
-        "//eval/public:unknown_function_result_set",
-        "//eval/public:unknown_set",
-        "//eval/public/structs:cel_proto_wrapper",
-        "//eval/testutil:test_message_cc_proto",
-        "@com_google_absl//absl/status",
-        "@com_google_absl//absl/time",
-        "@com_google_googletest//:gtest_main",
-        "@com_google_protobuf//:protobuf",
-    ],
-)
-
 cc_library(
     name = "matchers",
     srcs = ["matchers.cc"],
     hdrs = ["matchers.h"],
     deps = [
-        ":debug_string",
         "//eval/public:cel_value",
         "//eval/public:set_util",
         "//eval/public:unknown_set",