br 恢复的是提示 the config 'new_collation_enabled' not match

修改了playground的参数

[tidb@msyql8-ocp ~]$ cat tidb_bootstrap.toml
new_collations_enabled_on_first_bootstrap = false
[tidb@msyql8-ocp ~]$ 

[tidb@msyql8-ocp ~]$ 
[tidb@msyql8-ocp ~]$ tiup --tag downstream playground --host 192.168.2.82 --db 1 --pd 1 --kv 1 --tiflash 0 --ticdc 0  --db.config=/home/tidb/tidb_bootstrap.toml

Note: Version constraint  is resolved to v8.5.2. If you'd like to use other versions:

    Use exact version:      tiup playground v7.1.0
    Use version range:      tiup playground ^5
    Use nightly:            tiup playground nightly

Start pd instance: v8.5.2
Start tikv instance: v8.5.2
Start tidb instance: v8.5.2
Waiting for tidb instances ready
- TiDB: 192.168.2.82:4000 ... Done

🎉 TiDB Playground Cluster is started, enjoy!

Connect TiDB:    mysql --comments --host 192.168.2.82 --port 4000 -u root
TiDB Dashboard:  http://192.168.2.82:2379/dashboard
Grafana:         http://192.168.2.82:3000