test: add tests to reproduce panic on task spawn while drop

[kwannoel]

Reproduce #228.

We instantiate a struct outside the thread, and then move it into a future. Subsequently we spawn the future in a thread, dropping the struct.

Then the panic is reproduced.

out.log

connection: broken pipe", details: [], metadata: MetadataMap { headers: {} }
thread '<unnamed>' panicked at /risingwave/.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-0.2.30/src/sim/runtime/context.rs:27:44:
there is no reactor running, must be called from the context of a Madsim runtime
stack backtrace:
   0: rust_begin_unwind
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/core/src/panicking.rs:74:14
   2: core::panicking::panic_display
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/core/src/panicking.rs:264:5
   3: core::option::expect_failed
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/core/src/option.rs:2030:5
   4: expect<alloc::sync::Arc<madsim::sim::task::TaskInfo, alloc::alloc::Global>>
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/core/src/option.rs:933:21
   5: {closure#0}
             at ./.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-0.2.30/src/sim/runtime/context.rs:27:44
   6: try_with<core::cell::RefCell<core::option::Option<alloc::sync::Arc<madsim::sim::task::TaskInfo, alloc::alloc::Global>>>, madsim::sim::runtime::context::current_task::{closure_env#0}, alloc::sync::Arc<madsim::sim::task::TaskInfo, alloc::alloc::Global>>
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/std/src/thread/local.rs:283:12
   7: with<core::cell::RefCell<core::option::Option<alloc::sync::Arc<madsim::sim::task::TaskInfo, alloc::alloc::Global>>>, madsim::sim::runtime::context::current_task::{closure_env#0}, alloc::sync::Arc<madsim::sim::task::TaskInfo, alloc::alloc::Global>>
             at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library/std/src/thread/local.rs:260:9
   8: current_task
             at ./.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-0.2.30/src/sim/runtime/context.rs:27:10
   9: current
             at ./.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-0.2.30/src/sim/task/mod.rs:586:20
  10: spawn<sqlx_core::pool::connection::{impl#5}::return_to_pool::{async_block_env#1}<sqlx_sqlite::database::Sqlite>>
             at ./.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-0.2.30/src/sim/task/mod.rs:664:5
  11: spawn<sqlx_core::pool::connection::{impl#5}::return_to_pool::{async_block_env#1}<sqlx_sqlite::database::Sqlite>>
             at ./.cargo/registry/src/index.crates.io-6f17d22bba15001f/madsim-tokio-0.2.30/src/sim/runtime.rs:152:9
  12: spawn<sqlx_core::pool::connection::{impl#5}::return_to_pool::{async_block_env#1}<sqlx_sqlite::database::Sqlite>>