Redmine upgrades

Planning upgrades to Redmine 7.0, the only fully supported line, from 6.x and from unsupported 5.1 and older releases.

Redmine 6 to 7 upgrade

Upgrading Redmine 6.0 or 6.1 to 7.0: the Rails 8 move, Ruby version checks, plugin and theme compatibility after removed icon classes, sudo mode now on by default, and a tested rollback.

Upgrading unsupported Redmine 5.1 and older

Bringing an unsupported Redmine 5.1 or older installation to 7.0: Ruby and database upgrades underneath, abandoned plugins to replace, multi-step migrations and how to stage the jump safely.

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