## Problem
Currently, we run the `pg_regress` tests only for PG16
However, PG17 is a part of Neon and should be tested as well
## Summary of changes
Modified the workflow and added a patch for PG17 enabling the
`pg_regress` tests.
The problem with leftovers was solved by using branches.
## Problem
We need to be able to run the regression tests against a cloud-based
Neon staging instance to prepare the migration to the arm architecture.
## Summary of changes
Some tests were modified to work on the cloud instance (i.e. added
passwords, server-side copy changed to client-side, etc)
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Co-authored-by: Alexander Bayandin <alexander@neon.tech>