Configure plugin doesn't show the configured value

[gaoxingliang]

Issue description

When editing a plugin at global level, the configuration is not shown after re-edit:

After checking, some plugins (eg elasticsearch-logger) support showing the configured configurations while some not (eg:file-logger, clickhouse-logger)

My version is:2.15.0

Expected behavior

It should show the configured values.

How to Reproduce

1. Go to the plugins and configure one.
2. here is the official online playground： http://20.210.250.99:9000/plugin/list

Screenshots

No response

Environment

• apisix version (cmd: apisix version): 2.15.0
• OS (cmd: uname -a):
• OpenResty / Nginx version (cmd: nginx -V or openresty -V):
• etcd version, if have (cmd: run etcd --version):
• apisix-dashboard version, if have:
• Browser version, if have:

Additional context

No response

[Baoyuantop]

Fixed by #2718