Refactor PostgreSQL logic

What does this Merge Request do and why?

This MR aims to refactor and improve the PostgreSQL logic to make upcoming relating MRs less complex.

Merge Request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise Issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.

added Category:GDK Engineering Productivity Quality labels

assigned to @ashmckenzie

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Reviewer	Maintainer
No reviewer available	Toon Claes (@toon) (UTC+2, 8 hours behind @ashmckenzie)

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changed milestone to %15.2

added typemaintenance label

marked this merge request as draft

added 1 commit

• c64bfa3a - Add coverage for #ready?

Compare with previous version

marked this merge request as ready

mentioned in merge request !2574 (closed)

@toon as mentioned over at !2574 (diffs, comment 1026043500), may you please review this, thanks.

requested review from @toon

resolved all threads

approved this merge request

@ashmckenzie No serious comments, feel free to ignore my comments, pre-approving.

removed review request for @toon

changed milestone to %15.3

mentioned in merge request gitlab!103657 (merged)

changed milestone to %15.6

changed milestone to %15.11

changed milestone to %16.0

added 832 commits

• c64bfa3a...51368702 - 826 commits from branch main
• ef401d9a - Add some spacing for readability
• 597bb2ac - Inject GDK.config and use config objects more
• 1b117d12 - Rename to #stub_pg_version_file
• 863912c4 - Pull #stub_pg_data_dir from #stub_pg_version_file
• c11e930f - Add coverage for #current_data_dir and #psql_cmd
• 2cc709b4 - Add coverage for #ready?

Compare with previous version

	1 Warning
	Please add a merge request subtype to this merge request.

Reviewer roulette

Changes that require review have been detected! A merge request is normally reviewed by both a reviewer and a maintainer in its primary category and by a maintainer in all other categories.

To spread load more evenly across eligible reviewers, Danger has picked a candidate for each review slot. Feel free to override these selections if you think someone else would be better-suited or use the GitLab Review Workload Dashboard to find other available reviewers.

To read more on how to use the reviewer roulette, please take a look at the Engineering workflow and code review guidelines. Please consider assigning a reviewer or maintainer who is a domain expert in the area of the merge request.

Once you've decided who will review this merge request, mention them as you normally would! Danger does not automatically notify them for you.

Category	Reviewer	Maintainer
None	Lukas Eipert (@leipert) (UTC+2, 8 hours behind @ashmckenzie)	Tiger Watson (@tigerwnz) (UTC+10, same timezone as @ashmckenzie)

If needed, you can retry the danger-review job that generated this comment.

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added maintenancerefactor label

added 54 commits

• 2cc709b4...ef858e51 - 48 commits from branch main
• f3e80c83 - Add some spacing for readability
• 2b600a11 - Inject GDK.config and use config objects more
• 494a2d96 - Rename to #stub_pg_version_file
• 6cdbe1c3 - Pull #stub_pg_data_dir from #stub_pg_version_file
• 9d6f9727 - Add coverage for #current_data_dir and #psql_cmd
• 51f066fc - Add coverage for #ready?

Compare with previous version

Reviewer roulette

Changes that require review have been detected! A merge request is normally reviewed by both a reviewer and a maintainer in its primary category and by a maintainer in all other categories.

To spread load more evenly across eligible reviewers, Danger has picked a candidate for each review slot. Feel free to override these selections if you think someone else would be better-suited or use the GitLab Review Workload Dashboard to find other available reviewers.

To read more on how to use the reviewer roulette, please take a look at the Engineering workflow and code review guidelines. Please consider assigning a reviewer or maintainer who is a domain expert in the area of the merge request.

Once you've decided who will review this merge request, mention them as you normally would! Danger does not automatically notify them for you.

Category	Reviewer	Maintainer
None	Lukas Eipert (@leipert) (UTC+2, 8 hours behind @ashmckenzie)	Tiger Watson (@tigerwnz) (UTC+10, same timezone as @ashmckenzie)

If needed, you can retry the danger-review job that generated this comment.

Generated by Danger

Performing a final test locally of this branch

Tested and @toon has already approved, so merging

resolved all threads

started a merge train

merged

mentioned in commit 8f59b9aa