Replace use of 'getProject' in RoutingNodes (#123567)

When #119968 was merged into multi-project we introduced a regression by
inserting a call to `.getProject()` within the `RoutingNodes` class that
was supposed to be multi-project-aware.

This commit replaces those calls with `.indexMetadata` lookups

Author: tvernum

server/src/main/java/org/elasticsearch/cluster/routing/RoutingNodes.java

@@ -1340,7 +1340,7 @@ public void resetFailedCounter(RoutingAllocation allocation) {
             if (failedAllocations > 0) {
                 try {
                     final var maxRetry = SETTING_ALLOCATION_MAX_RETRY.get(
-                        allocation.metadata().getProject().getIndexSafe(shardRouting.index()).getSettings()
+                        allocation.metadata().indexMetadata(shardRouting.index()).getSettings()
                     );
                     if (failedAllocations >= maxRetry) {
                         shardsWithMaxFailedAllocations++;
@@ -1378,7 +1378,7 @@ public void resetFailedCounter(RoutingAllocation allocation) {
                     try {
                         int failedRelocations = shardRouting.relocationFailureInfo().failedRelocations();
                         final var maxRetry = SETTING_ALLOCATION_MAX_RETRY.get(
-                            allocation.metadata().getProject().getIndexSafe(shardRouting.index()).getSettings()
+                            allocation.metadata().indexMetadata(shardRouting.index()).getSettings()
                         );
                         if (failedRelocations >= maxRetry) {
                             shardsWithMaxFailedRelocations++;