Multiple improvements to check-versions script

Issue information

From user: jonathan1055

Related to !260 (merged)

Contribution record

Fork management

Problem/Motivation

This issue is created as a spin-off from #3463894: Update templates so 11.0 is the default/current branch - during the course of that work, many improvements to the check-versions php script have been made. Some of these were needed for D11, others are general improvements to make it easier to understand the output and determine the new values. All of these changes can be made before that main MR is merged, and they are creating noise there. Having this worked separated out will make reviewing easier for both.

Proposed resolution

Extract the changed to check-versions.php and .env.example into a separate MR, for commtting sooner, before MR242

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