Centipede: Add runner_utils library and update engine_worker/sancov_runtime to use it.

Introduce runner_utils target to avoid duplicate symbols when linking engine
worker and sancov runtime.

PiperOrigin-RevId: 962930004

centipede/BUILD

diff --git a/centipede/BUILD b/centipede/BUILD
index 3ad6fae..a2b30e8 100644
--- a/centipede/BUILD
+++ b/centipede/BUILD
@@ -1003,8 +1003,6 @@
     name = "engine_worker",
     srcs = [
         "engine_worker.cc",
-        "runner_utils.cc",
-        "runner_utils.h",
     ],
     hdrs = ["engine_worker_abi.h"],
     deps = [
@@ -1013,6 +1011,7 @@
         ":feature",
         ":runner_request",
         ":runner_result",
+        ":runner_utils",
         ":shared_memory_blob_sequence",
         "@abseil-cpp//absl/base:nullability",
         "@com_google_fuzztest//common:defs",
@@ -1240,8 +1239,6 @@
         "reverse_pc_table.h",
         "runner_dl_info.cc",
         "runner_dl_info.h",
-        "runner_utils.cc",
-        "runner_utils.h",
         "sancov_callbacks.cc",
         "sancov_interceptors.cc",
         "sancov_object_array.cc",
@@ -1263,6 +1260,7 @@
         ":foreach_nonzero",
         ":int_utils",
         ":runner_cmp_trace",
+        ":runner_utils",
         "@abseil-cpp//absl/base:core_headers",
         "@abseil-cpp//absl/base:nullability",
         "@abseil-cpp//absl/numeric:bits",
@@ -2026,3 +2024,13 @@
         ":test_util_sh",
     ],
 )
+
+cc_library(
+    name = "runner_utils",
+    srcs = ["runner_utils.cc"],
+    hdrs = ["runner_utils.h"],
+    copts = DISABLE_SANCOV_COPTS,
+    deps = [
+        "@abseil-cpp//absl/base:nullability",
+    ],
+)