fix: legacy component serialisation was wiped out

When merging 2e419805ad, nobody caught the
fact we removed the component serialisation of legacy BungeeCord Chat
API components in the PacketPlayOutTitle class.

Test plugin code:

```kotlin
class LegacyMessageCommand : BaseCommand() {
    override fun register(manager: PaperCommandManager<CommandSender>) {
        manager.command(manager.commandBuilder("legacymsg")
            .sender<Player>()
            .handler {
                val component = ComponentBuilder("Test")
                    .color(ChatColor.DARK_RED)
                    .bold(true)
                    .append(" message")
                    .bold(false)
                    .color(ChatColor.of("#f8a8a8"))
                    .event(
                        HoverEvent(
                            HoverEvent.Action.SHOW_TEXT,
                            Text(
                                ComponentBuilder("Test hover")
                                    .color(ChatColor.AQUA)
                                    .underlined(true)
                                    .create()
                            )
                        )
                    )
                    .event(
                        ClickEvent(
                            ClickEvent.Action.SUGGEST_COMMAND,
                            "/legacymsg"
                        )
                    )
                    .create()
                it.sender.sendMessage(*component)
                it.sender.sendActionBar(*component)
                it.sender.sendTitle(
                    Title.builder()
                        .title(component)
                        .subtitle(component)
                        .fadeIn(40)
                        .stay(60)
                        .fadeOut(40)
                        .build()
                )
            })
    }
}
```

Fixes GH-5271.

Spigot-Server-Patches/Player-Tab-List-and-Title-APIs.patch

@@ -16,6 +16,22 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          @Nullable
          public static IChatMutableComponent a(String s) {
              return (IChatMutableComponent) ChatDeserializer.a(IChatBaseComponent.ChatSerializer.a, s, IChatMutableComponent.class, false);
+diff --git a/src/main/java/net/minecraft/server/PacketDataSerializer.java b/src/main/java/net/minecraft/server/PacketDataSerializer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PacketDataSerializer.java
++++ b/src/main/java/net/minecraft/server/PacketDataSerializer.java
+@@ -0,0 +0,0 @@ public class PacketDataSerializer extends ByteBuf {
+     public PacketDataSerializer writeComponent(final net.kyori.adventure.text.Component component) {
+         return this.writeUtf(PaperAdventure.asJsonString(component, this.adventure$locale), 262144);
+     }
++
++    @Deprecated
++    public PacketDataSerializer writeComponent(final net.md_5.bungee.api.chat.BaseComponent[] component) {
++        return this.writeUtf(net.md_5.bungee.chat.ComponentSerializer.toString(component), 262144);
++    }
+     // Paper end
+ 
+     public PacketDataSerializer a(IChatBaseComponent ichatbasecomponent) {
 diff --git a/src/main/java/net/minecraft/server/PacketPlayOutTitle.java b/src/main/java/net/minecraft/server/PacketPlayOutTitle.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/PacketPlayOutTitle.java
@@ -38,6 +54,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
      @Override
      public void b(PacketDataSerializer packetdataserializer) throws IOException {
+@@ -0,0 +0,0 @@ public class PacketPlayOutTitle implements Packet<PacketListenerPlayOut> {
+             // Paper start
+             if (this.adventure$text != null) {
+                 packetdataserializer.writeComponent(this.adventure$text);
++            } else if (this.components != null) {
++                packetdataserializer.writeComponent(this.components);
+             } else
+             // Paper end
+             packetdataserializer.a(this.b);
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java