Get current LogFileNumberSize the same as log_writer (#10086)

Get current LogFileNumberSize the same as log_writer (#10086)

Summary:
`db_impl.alive_log_files_` is used to track the WAL size in `db_impl.logs_`.
Get the `LogFileNumberSize` obj in `alive_log_files_` the same time as `log_writer` to keep them consistent.
For this issue, it's not safe to do `deque::reverse_iterator::operator*` and `deque::pop_front()` concurrently,
so remove the tail cache.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10086

Test Plan:
```
# on Windows
gtest-parallel ./db_test --gtest_filter=DBTest.FileCreationRandomFailure -r 1000 -w 100
```

Reviewed By: riversand963

Differential Revision: D36822373

Pulled By: jay-zhuang

fbshipit-source-id: 5e738051dfc7bcf6a15d85ba25e6365df6b6a6af