Fix double encoding of inputs in worker request

Since `WorkRequest` encodes strings as UTF-8, Bazel's internal string encoding of file paths needs to be undone before passing them to the protobuf builder.

Closes #23924.

PiperOrigin-RevId: 690737819
Change-Id: I3eb341c05e045c75ac004da57e1f46f3587a6810

src/main/java/com/google/devtools/build/lib/worker/BUILD

@@ -76,6 +76,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/exec/local",
         "//src/main/java/com/google/devtools/build/lib/profiler",
         "//src/main/java/com/google/devtools/build/lib/sandbox:sandbox_helpers",
+        "//src/main/java/com/google/devtools/build/lib/util:string",
         "//src/main/java/com/google/devtools/build/lib/util/io",
         "//src/main/java/com/google/devtools/build/lib/vfs",
         "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",

src/main/java/com/google/devtools/build/lib/worker/WorkerSpawnRunner.java

@@ -15,6 +15,7 @@
 package com.google.devtools.build.lib.worker;
 
 import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.devtools.build.lib.util.StringUtil.reencodeInternalToExternal;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.common.base.Stopwatch;
@@ -274,7 +275,10 @@ private WorkRequest createWorkRequest(
         digest = ByteString.copyFromUtf8(HashCode.fromBytes(digestBytes).toString());
       }
 
-      requestBuilder.addInputsBuilder().setPath(input.getExecPathString()).setDigest(digest);
+      requestBuilder
+          .addInputsBuilder()
+          .setPath(reencodeInternalToExternal(input.getExecPathString()))
+          .setDigest(digest);
     }
     if (workerOptions.workerVerbose) {
       requestBuilder.setVerbosity(VERBOSE_LEVEL);