chore: use a central code location to check PHP version

[DeepDiver1975]

Description

Some refactoring as part of the work related to #40981

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[sonarqubecloud]

SonarCloud Quality Gate failed.   

1 Bug
0 Vulnerabilities
5 Security Hotspots
45 Code Smells

3.9% Coverage
0.0% Duplication

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[phil-davis]

$ php occ a:l -e
This version of ownCloud is not compatible with PHP 8.0
You are currently running PHP 8.1.23.

It is not compatible with PHP 8.0 or later, but I suppose that the message is OK - people should be able to work out that PHP 8.1... is also not going to work.