Print file number when TEST_VerifyNoObsoleteFilesCached fails

[hx235]

Context/Summary:

#13117 added check for obsolete SST files that are not cleaned up timely. It caused a infrequent stress test failure assertion="live_and_quar_files.find(file_number) != live_and_quar_files.end()" that I haven't repro-ed yet.

This PR prints the file number so we can find out what happens to that file through info logs when encountering the same failure.

Test:
Manually fail the assertion and observe the stderr printing

[ RUN      ] DBBasicTest.UniqueSession
File 12 is not live nor quarantined
db_basic_test: db/db_impl/db_impl_debug.cc:384: rocksdb::DBImpl::TEST_VerifyNoObsoleteFilesCached(bool) const::<lambda(const rocksdb::Slice&, rocksdb::Cache::ObjectPtr, size_t, const rocksdb::Cache::CacheItemHelper*)>: Assertion `false' failed. 

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@hx235 has updated the pull request. You must reimport the pull request before landing.

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@hx235 has updated the pull request. You must reimport the pull request before landing.

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@hx235 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@hx235 has updated the pull request. You must reimport the pull request before landing.

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@hx235 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[pdillinger]

Thanks!

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@hx235 merged this pull request in 0f35db5.