fix(wal): fix cleaning up after dropped tables

[ideoma]

Sometimes when QuestDB is restarted often some dropped tables can be left on the disk and QuestDB logs a critical error on startup that they will not be available to query. This happens especially often on Windows.

Also removes the error message

2023-02-22T14:25:55.185855Z E i.q.c.O3PartitionPurgeJob unknown directory [table=cpu~2741, dir=txn_seq]

[ideoma]

[PR Coverage check]

😍 pass : 148 / 177 (83.62%)

file detail

	path	covered line	new line	coverage
🔵	io/questdb/cairo/DefaultCairoConfiguration.java	0	2	00.00%
🔵	io/questdb/cutlass/line/tcp/TableUpdateDetails.java	6	20	30.00%
🔵	io/questdb/cairo/wal/seq/TableSequencerAPI.java	12	17	70.59%
🔵	io/questdb/cairo/CommitFailedException.java	6	8	75.00%
🔵	io/questdb/cutlass/line/tcp/LineTcpMeasurementScheduler.java	11	13	84.62%
🔵	io/questdb/cairo/wal/ApplyWal2TableJob.java	12	14	85.71%
🔵	io/questdb/cairo/wal/seq/TableSequencerImpl.java	15	16	93.75%
🔵	io/questdb/cairo/wal/WalPurgeJob.java	56	57	98.25%
🔵	io/questdb/PropServerConfiguration.java	2	2	100.00%
🔵	io/questdb/cairo/wal/CheckWalTransactionsJob.java	2	2	100.00%
🔵	io/questdb/cairo/O3PartitionPurgeJob.java	1	1	100.00%
🔵	io/questdb/PropertyKey.java	2	2	100.00%
🔵	io/questdb/cairo/pool/AbstractMultiTenantPool.java	1	1	100.00%
🔵	io/questdb/cairo/TableNameRegistryFileStore.java	16	16	100.00%
🔵	io/questdb/cairo/AbstractTableNameRegistry.java	1	1	100.00%
🔵	io/questdb/cairo/CairoException.java	5	5	100.00%