fix: avoid break when drop wal table failed

[MichaelLeeHZ]

Which issue does this PR close?

Closes #

Rationale for this change

It occurs error when dropping expired wal table.

2023-04-04 12:08:40.363 ERRO [components/table_kv/src/obkv.rs:439] Failed to drop table, table_name:wal_wal_20230317000000_000003, err:Table not dropped, table:wal_wal_20230317000000_000003.
Backtrace:
0 <snafu::backtrace_shim::Backtrace as snafu::GenerateBacktrace>::generate::hfa679d2c718d0b38
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/snafu-0.6.10/src/backtrace_shim.rs:15
  table_kv::obkv::TableNotDropped<__T0>::build::hf3dea826ebd60599
  /xunming/ceresdb/components/table_kv/src/obkv.rs:23
  table_kv::obkv::TableNotDropped<__T0>::fail::hfb145a30c5888703
  /xunming/ceresdb/components/table_kv/src/obkv.rs:23
  table_kv::obkv::ObkvImpl::try_drop_kv_table::h7edb8769b0ed116c
  /xunming/ceresdb/components/table_kv/src/obkv.rs:374
  <table_kv::obkv::ObkvImpl as table_kv::TableKv>::drop_table::h3b83a7345d116784
  /xunming/ceresdb/components/table_kv/src/obkv.rs:438
1 wal::table_kv_impl::namespace::purge_buckets::hb4395adb5b50e83e
  /xunming/ceresdb/wal/src/table_kv_impl/namespace.rs:1444
2 wal::table_kv_impl::namespace::NamespaceInner<T>::load_buckets::{{closure}}::h4922baf7634505ad
  /xunming/ceresdb/wal/src/table_kv_impl/namespace.rs:354
  <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll::h270e8b114cddbb1b
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/tokio-1.25.0/src/runtime/blocking/task.rs:42
  tokio::runtime::task::core::Core<T,S>::poll::{{closure}}::hea44e76037d909f7
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/tokio-1.25.0/src/runtime/task/core.rs:223
  tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut::h24af6522353d4a69
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/tokio-1.25.0/src/loom/std/unsafe_cell.rs:14
  tokio::runtime::task::core::Core<T,S>::poll::h378d8040acaefa93
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/tokio-1.25.0/src/runtime/task/core.rs:212
  tokio::runtime::task::harness::poll_future::{{closure}}::h92d37d5647cfe3a6
  /root/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/tokio-1.25.0/src/runtime/task/harness.rs:476
  <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h3dc7a85ad1d5e8ec
  /rustc/11d96b59307b1702fffe871bfc2d0145d070881e/library/core/src/panic/unwind_safe.rs:271
  std::panicking::try::do_call::hd1d739daf4f7b5fa
  /rustc/11d96b59307b1702fffe871bfc2d0145d070881e/library/std/src/panicking.rs:483
  std::panicking::try::hd06767296cb7e461
  /rustc/11d96b59307b1702fffe871bfc2d0145d070881e/library/std/src/panicking.rs:447
  std::panic::catch_unwind::h51d62c40d2d54cda
  /rustc/11d96b59307b1702fffe871bfc2d0145d070881e/library/std/src/panic.rs:140

What changes are included in this PR?

Print error log when dropping expired wal table failed, and continue to drop other tables.

Are there any user-facing changes?

None

How does this change test

[codecov-commenter]

Codecov Report

Merging #806 (cdb582b) into main (0831a84) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head cdb582b differs from pull request most recent head c39df85. Consider uploading reports for the commit c39df85 to get more accurate results

@@           Coverage Diff           @@
##             main     #806   +/-   ##
=======================================
  Coverage   68.18%   68.18%           
=======================================
  Files         295      295           
  Lines       46880    46823   -57     
=======================================
- Hits        31963    31925   -38     
+ Misses      14917    14898   -19     

Impacted Files	Coverage Δ
analytic_engine/src/instance/open.rs	80.69% <ø> (-0.06%)	⬇️
analytic_engine/src/manifest/details.rs	95.63% <ø> (-0.03%)	⬇️
catalog/src/schema.rs	78.26% <ø> (-0.91%)	⬇️
catalog_impls/src/table_based.rs	83.43% <ø> (-0.03%)	⬇️
...nterpreters/src/table_manipulator/catalog_based.rs	98.13% <ø> (-0.02%)	⬇️
server/src/grpc/meta_event_service/mod.rs	0.00% <ø> (ø)
system_catalog/src/sys_catalog_table.rs	92.19% <ø> (-0.03%)	⬇️
table_engine/src/engine.rs	55.07% <ø> (+0.78%)	⬆️
analytic_engine/src/table/data.rs	91.25% <100.00%> (-0.29%)	⬇️

... and 5 files with indirect coverage changes

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[Rachelint]

LGTM