Remove exec platform and properties from SymlinkAction

Similar to #14827
When C++ toolchain is built for toolchains, exec platform is set and when it's built for `_cc_toolchain` implicit dependency it's not set.

With this and in specific configuration `cc_toolchain` rule causes an action conflict.

PiperOrigin-RevId: 508270931
Change-Id: I316f401f454fabc4e5e3d8d295e1bf633141e1af

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

@@ -1493,6 +1493,7 @@ java_library(
     deps = [
         "//src/main/java/com/google/devtools/build/lib/actions",
         "//src/main/java/com/google/devtools/build/lib/actions:artifacts",
+        "//src/main/java/com/google/devtools/build/lib/analysis/platform",
         "//src/main/java/com/google/devtools/build/lib/collect/nestedset",
         "//src/main/java/com/google/devtools/build/lib/util",
         "//src/main/java/com/google/devtools/build/lib/util:detailed_exit_code",

src/main/java/com/google/devtools/build/lib/analysis/actions/SymlinkAction.java

@@ -15,6 +15,7 @@
 package com.google.devtools.build.lib.analysis.actions;
 
 import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.devtools.build.lib.actions.AbstractAction;
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
@@ -24,6 +25,7 @@
 import com.google.devtools.build.lib.actions.ActionResult;
 import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
+import com.google.devtools.build.lib.analysis.platform.PlatformInfo;
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
 import com.google.devtools.build.lib.server.FailureDetails;
@@ -347,4 +349,17 @@ private static DetailedExitCode createDetailedExitCode(String message, Code deta
             .setSymlinkAction(FailureDetails.SymlinkAction.newBuilder().setCode(detailedCode))
             .build());
   }
+
+  @Override
+  @Nullable
+  public PlatformInfo getExecutionPlatform() {
+    // SymlinkAction is platform agnostic.
+    return null;
+  }
+
+  @Override
+  public ImmutableMap<String, String> getExecProperties() {
+    // SymlinkAction is platform agnostic.
+    return ImmutableMap.of();
+  }
 }