Adds gh actions pipeline for build & test

[gurkanindibay]

TODO: After merging citusdata/tools#239 tools version should be updated with tag to be created

[hanefi]

@gurkanindibay please request reviews after the tests pass and the implementation is complete.

[hanefi]

These PG versions are not supported anymore. We can drop them.

[gurkanindibay]

@gurkanindibay please request reviews after the tests pass and the implementation is complete.

@hanefi there are compile and test errors. I've sent it to check and fix it. My main task is to add the pipeline not to fix the tests. If there are some parameters to add please notify me and I can add this param. But I think failures are not related to pipeline

[hanefi]

I fixed one missing test change we missed when bumping 2.17, and removed the PostgreSQL versions that EOLd.

All that is missing is a development on tools repository for PG15 support. I have an open PR citusdata/tools#239 . Can we use that here? That PR is not tested enough, and some more work may be needed. I guess that is part of creating the pipeline. Can you take over that PR @gurkanindibay ?