feat(ark): ready when advertising for join

First boot with the install fix ran ARK for ~10 minutes and found, in
ShooterGame.log: "Server: ... has successfully started!", "EOS ownership
validation initialized: Success", "Full Startup: 36.26 seconds" and,
about two minutes later, "Server has completed startup and is now
advertising for join. (9.96GB Mem)". That last line is when players,
console players through EOS included, can join, so it is the
readyPattern; the real line is test.yaml's readyExample. Boot tests now
wait for it instead of only checking ARK stays up for 10 minutes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

games/ark-survival-ascended-crossplay/game.yaml

@@ -325,6 +325,7 @@ agnosticCommandConfig:
   restPortKey: null
   restUser: null
 logFilePath: ShooterGame/Saved/Logs/ShooterGame.log
+readyPattern: Server has completed startup and is now advertising for join
 backupPaths:
   - ShooterGame/Saved
 maxBackupSizeMb: 4096