Improvements in PostgreSQL parameterisation logic

[sbluhm]

What does this PR change?

• Allow parameterisation of min/max PostgreSQL version for Enterprise Linux same as for SUSE Leap.
• Adapt usage of postgresql_version_max to allow minor versions. Otherwise max version would be limited to the major version itself (i.e. 15.0.0).
• Remove creation of initdb symlink for Enterprise Linux to avoid package conflicts with PostgreSQL 15.
• Replaced invalid use of Conflicts in spec file with Requires. "If the software links to the libraries of another package, it must use Requires: instead of Conflicts: to mark that dependency."

GUI diff

No difference.

• [x] DONE

Documentation

• No documentation needed: only internal and user invisible changes

• [x] DONE

Test coverage

• No tests: already covered

• [x] DONE

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Issue(s): # Ports(s): # add downstream PR(s), if any

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[sbluhm]

FYI @aaannz

[sbluhm]

Looks good, but just to clarify and agree we are on the same page Initial idea was to use these variables to specify just one major version allowed.

Thank you for clarifying the understanding. I thought supplying "min" and "max" meant that you can use all versions that are allowed. For EL, I was planning to use/focus on v15 and stop working on/with v14. So your suggestion would work fine for me (until v16).

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[mcalmer]

@deneb-alpha i have the feeling that we have half of this already. Please check if we still need something of it.

[sbluhm]

I am happy to close this request as I don't require it anymore. But I still think the elements should be corrected. Do feel free to close it if you disagree.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[cbosdo]

@aaannz what do you think? We can probably close it