[test] avoid running sqlcipher synchonous tests when benchmarking

SQLCipher synchronous benchmark tests were introduced when we started
developing benchmark tests to compare synchronous and asynchronous code.
Synchronous access to sqlcipher database is not used in soledad, and
those tests are much slower than asynchronous tests (more than 10 times
using ssd drive), so we want to avoid running them on ci. This commit
introduces a "synchronous" marker and avoid running tests markes as such
in ci environment.

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