Zammad upgrades

Version-specific upgrade pages for Zammad major and minor releases with breaking changes.

Zammad 6.5 to 7.2 upgrade

Upgrading Zammad 6.5 to the 7.x line: moving off MySQL to PostgreSQL, replacing removed Slack and Twitter integrations, Elasticsearch 8.15 and reindexing, nginx and CSP changes, and the operating system support to check first.

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