Stop using the actionAndCommand platform key extractor

This is only needed to support versions of Bazel below 4.1.0 (released
on 2021-05-21). bb_browser isn't even capable of displaying platform
properties stored in Command messages.

Author: EdSchouten

bare/config/scheduler.jsonnet

@@ -22,7 +22,7 @@ local common = import 'common.libsonnet';
   killOperationsAuthorizer: { allow: {} },
   actionRouter: {
     simple: {
-      platformKeyExtractor: { actionAndCommand: {} },
+      platformKeyExtractor: { action: {} },
       invocationKeyExtractors: [
         { correlatedInvocationsId: {} },
         { toolInvocationId: {} },

docker-compose/config/scheduler.jsonnet

@@ -26,7 +26,7 @@ local common = import 'common.libsonnet';
   killOperationsAuthorizer: { allow: {} },
   actionRouter: {
     simple: {
-      platformKeyExtractor: { actionAndCommand: {} },
+      platformKeyExtractor: { action: {} },
       invocationKeyExtractors: [
         { correlatedInvocationsId: {} },
         { toolInvocationId: {} },

kubernetes/config/scheduler.jsonnet

@@ -26,7 +26,7 @@ local common = import 'common.libsonnet';
   killOperationsAuthorizer: { allow: {} },
   actionRouter: {
     simple: {
-      platformKeyExtractor: { actionAndCommand: {} },
+      platformKeyExtractor: { action: {} },
       invocationKeyExtractors: [
         { correlatedInvocationsId: {} },
         { toolInvocationId: {} },