Remove redundant check from ctx.actions.symlink.

If ctx.actions.symlink is called with a target_path argument, the output must be an unresolved symlink created by declare_symlink, which already requires --experimental_allow_unresolved_symlinks to be enabled.

PiperOrigin-RevId: 485903233
Change-Id: I2e874bc88fdadc2b41964d5f84f38f85e317829a

src/main/java/com/google/devtools/build/lib/analysis/starlark/StarlarkActionFactory.java

@@ -311,12 +311,6 @@ public void symlink(
                 ruleContext.getActionOwner(), inputArtifact, outputArtifact, progressMessage);
       }
     } else {
-      if (!ruleContext.getConfiguration().allowUnresolvedSymlinks()) {
-        throw Starlark.errorf(
-            "actions.symlink() to unresolved symlink is not allowed; "
-                + "use the --experimental_allow_unresolved_symlinks command line option");
-      }
-
       if (!outputArtifact.isSymlink()) {
         throw Starlark.errorf(
             "symlink() with \"target_path\" param requires that \"output\" be declared as a "