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This patch adds an Alternator test reproducing issue #6389 - that concurrent TagResource and/or UntagResource operations was broken and some of the concurrent modifications were lost. The test has two threads, one loops adds and removes a tag A, the other adds and removes a tag B. After we add tag A, we expect tag A to be there - but due to issue #6389 this modification was sometimes lost when it raced with an operation on B. This test consistently failed before issue #6389 was fixed, and passes now after the issue was fixed by the previous patches. The bug reproduces by chance, so it requires a fairly long loop (a few seconds) to be sure it reproduces - so is marked a "veryslow" test and will not run in CI, but can be used to manually reproduce this issue with: test/alternator/run --runveryslow test_tag.py::test_concurrent_tag Refs #6389. Signed-off-by: Nadav Har'El <nyh@scylladb.com>