retry flaky databricks and motherduck remote tests#4046
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These two destinations fail every now and then transient and unrelated to the PR being tested. databricks throws ConnectionResetError/RequestError on connect, motherduck crashes the xdist worker (segfault in the duckdb extension).
Adds pytest-rerunfailures and opts in just those two (for now) via rerun_args in the matrix, scoped with --only-rerun so genuine failures still fail fast (motherduck uses a "sentinel" since only the crash needs retrying).
We can also extend this to other remote tests - but I'd keep it scoped