static user provider doesn't work for gRPC in v0.4.0

[killme2008]

What type of bug is this?

Unexpected error

What subsystems are affected?

Other

What happened?

Start the standalone with static user provider:

cargo run -- standalone start --user-provider=static_user_provider:cmd:greptime_user=greptime_pwd

But the user_provider in gRPC handler is always None, looks like the bug is back again.

greptimedb/src/servers/src/grpc/greptime_handler.rs

Line 70 in 0a9972a

let user_info = auth(self.user_provider.clone(), header, &query_ctx).await?;

And our test doesn't cover this case at all.

What operating system did you use?

Ubuntu 22

Relevant log output and stack trace

No response

How can we reproduce the bug?

As described above.

[evenyag]

@shuiyisong Can we close this PR now?

[shuiyisong]

@evenyag Yes. We'll track adding tests in #2579