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32ee8b877a
If pending changes aren't committed before test completed, it might cause
data race when we don't drain all the background goroutines.
```bash
$ cd server
$ go test -race -v -run TestApplyRepeat ./etcdserver
...
panic: Log in goroutine after TestApplyRepeat has completed: 2024-02-03T17:06:13.262+0800 DEBUG bbolt Committing transaction 2
goroutine 81 [running]:
testing.(*common).logDepth(0xc000502820, {0xc0001b0460, 0x41}, 0x3)
/usr/local/go/src/testing/testing.go:1022 +0x6d4
testing.(*common).log(...)
/usr/local/go/src/testing/testing.go:1004
testing.(*common).Logf(0xc000502820, {0x1421ad7, 0x2}, {0xc000603520, 0x1, 0x1})
/usr/local/go/src/testing/testing.go:1055 +0xa5
go.uber.org/zap/zaptest.testingWriter.Write({{0x15f1f90?, 0xc000502820?}, 0xda?}, {0xc000119800, 0x42, 0x400})
/home/fuwei/go/pkg/mod/go.uber.org/zap@v1.26.0/zaptest/logger.go:130 +0x11e
go.uber.org/zap/zapcore.(*ioCore).Write(0xc0000b55c0, {0xff, {0xc1679e614f9fd7a4, 0x73a3657, 0x1cc2400}, {0x1422b2d, 0x5}, {0xc0001a0330, 0x18}, {0x0, ...}, ...}, ...)
/home/fuwei/go/pkg/mod/go.uber.org/zap@v1.26.0/zapcore/core.go:99 +0x193
go.uber.org/zap/zapcore.(*CheckedEntry).Write(0xc000115930, {0x0, 0x0, 0x0})
/home/fuwei/go/pkg/mod/go.uber.org/zap@v1.26.0/zapcore/entry.go:253 +0x2f0
go.uber.org/zap.(*SugaredLogger).log(0xc0001960f8, 0xff, {0x1437885, 0x19}, {0xc0006034e0, 0x1, 0x1}, {0x0, 0x0, 0x0})
/home/fuwei/go/pkg/mod/go.uber.org/zap@v1.26.0/sugar.go:316 +0x130
go.uber.org/zap.(*SugaredLogger).Debugf(...)
/home/fuwei/go/pkg/mod/go.uber.org/zap@v1.26.0/sugar.go:171
go.etcd.io/bbolt.(*Tx).Commit(0xc0001aa9a0)
/home/fuwei/go/pkg/mod/go.etcd.io/bbolt@v1.4.0-alpha.0/tx.go:173 +0x206
go.etcd.io/etcd/server/v3/storage/backend.(*batchTx).commit(0xc00019b180, 0x0)
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/batch_tx.go:269 +0xdf
go.etcd.io/etcd/server/v3/storage/backend.(*batchTxBuffered).unsafeCommit(0xc00019b180, 0x0)
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/batch_tx.go:378 +0x425
go.etcd.io/etcd/server/v3/storage/backend.(*batchTxBuffered).commit(0xc00019b180, 0x80?)
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/batch_tx.go:355 +0x78
go.etcd.io/etcd/server/v3/storage/backend.(*batchTxBuffered).Commit(0xc00019b180)
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/batch_tx.go:342 +0x35
go.etcd.io/etcd/server/v3/storage/backend.(*backend).run(0xc000478180)
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/backend.go:426 +0x2c7
created by go.etcd.io/etcd/server/v3/storage/backend.newBackend in goroutine 80
/home/fuwei/go/src/go.etcd.io/etcd/server/storage/backend/backend.go:227 +0xbfd
FAIL go.etcd.io/etcd/server/v3/etcdserver 0.129s
FAIL
```
This patch also drains goroutines related to raftNode and watch store.
Signed-off-by: Wei Fu <fuweid89@gmail.com>