The id of S3GCManager is not set correctly

[JaySon-Huang]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

When deployed with tidb-operator, we use a config file as following

[flash]
service_addr = "0.0.0.0:3930"
tidb_status_addr = "cluster-tidb.tidb.svc:10080"
  [flash.proxy]
  addr = "0.0.0.0:20170"
  advertise-addr = "cluster-tiflash-0.cluster-tiflash-peer.tidb.svc:20170"
  engine-addr = "cluster-tiflash-0.cluster-tiflash-peer.tidb.svc:3930"

2. What did you expect to see? (Required)

Under disagg arch, S3GCManager should use flash.proxy.engine-addr as its own ID. Other S3GC non-leader node use this ID to connect to the S3GC leader

3. What did you see instead (Required)

Now S3GCManager use flash.service_addr as its own ID

4. What is your TiFlash version? (Required)

master