fix(postgres): use schema for foreign key constrains of a table

[alesmenzel]

Pull Request Checklist

• Have you added new tests to prevent regressions?
• If a documentation update is necessary, have you opened a PR to the documentation repository?
• Did you update the typescript typings accordingly (if applicable)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
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Description Of Change

Closes #16230

Todos

• write a test for it

[alesmenzel]

@ephys @WikiRik Added a regression test, there seems to be 1 test failing (function "add_one" already exists with same argument types) unrelated to the code changes - it is failing even in the origin/v6.

[alesmenzel]

Hi, could you please review the changes, thanks.

[github-actions]

🎉 This PR is included in version 6.37.3 🎉

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