Fix default Minecraft join message not being used

[abulujayn]

Information

This PR fixes #5796.

Details

Proposed fix:

• Add permission check for essentials.silentjoin/essentials.silentjoin.vanish
• Remove broadcast of join message when allowSilentJoinQuit() is true

Environments tested:

OS: Windows 11

Java version: Corretto-21.0.3.9.1

• [x] Most recent Paper version (1.20.6-147-ver/1.20.6@e41d44f)
• [ ] CraftBukkit/Spigot/Paper 1.12.2
• [ ] CraftBukkit 1.8.8

Demonstration: