[1.18] Fix tags command suggestion to include dynamic registries (#8638)

Manually entering the names of dynamic registries work as expected. The
suggestions for registries didn't include dynamic registries because
they queried the static registries rather than querying all registries
from the server's `RegistryAccess` (which includes both static
registries and dynamic registries).

src/main/java/net/minecraftforge/server/command/TagsCommand.java

@@ -24,6 +24,7 @@ import net.minecraft.commands.arguments.ResourceLocationArgument;
 import net.minecraft.core.Holder;
 import net.minecraft.core.HolderSet;
 import net.minecraft.core.Registry;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.network.chat.ClickEvent;
 import net.minecraft.network.chat.ComponentUtils;
 import net.minecraft.network.chat.HoverEvent;
@@ -232,8 +233,11 @@ class TagsCommand
     private static CompletableFuture<Suggestions> suggestRegistries(final CommandContext<CommandSourceStack> ctx,
             final SuggestionsBuilder builder)
     {
-        ctx.getSource().suggestRegistryElements(Registry.REGISTRY,
-                SharedSuggestionProvider.ElementSuggestionType.ELEMENTS, builder);
+        ctx.getSource().registryAccess().registries()
+                .map(RegistryAccess.RegistryEntry::key)
+                .map(ResourceKey::location)
+                .map(ResourceLocation::toString)
+                .forEach(builder::suggest);
         return builder.buildFuture();
     }