Update the open source filegroup rule to disable toolchain resolution.

The internal version of this rule has toolchain resolution disabled, and
this has been widely documented, so it is easiest to update the external
version of the rule to match.

Closes bazelbuild#13194.

PiperOrigin-RevId: 362067102

src/main/java/com/google/devtools/build/lib/bazel/rules/common/BazelFilegroupRule.java

@@ -22,6 +22,7 @@
 import com.google.devtools.build.lib.analysis.RuleDefinition;
 import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
 import com.google.devtools.build.lib.packages.RuleClass;
+import com.google.devtools.build.lib.packages.RuleClass.ToolchainResolutionMode;
 import com.google.devtools.build.lib.rules.filegroup.Filegroup;
 import com.google.devtools.build.lib.util.FileTypeSet;
 
@@ -75,6 +76,7 @@ public RuleClass build(RuleClass.Builder builder, RuleDefinitionEnvironment env)
             attr("path", STRING)
                 .undocumented(
                     "only used to expose FilegroupPathProvider, which is not currently used"))
+        .useToolchainResolution(ToolchainResolutionMode.DISABLED)
         .build();
   }