5.65.alpha1 - Define pre-upgrade snapshots (Option B)

[totten]

Overview

For data-structures that are modified by the 5.65.alpha1 upgrade, create some snapshots (just in case we discover some schema problem later on).

This is one of two options. Option B uses a new Smarty helper ({crmUpgradeSnapshot}) and puts the calls inline (adjacent to the actual upgrade steps). This should be an easier exemplar to follow in the future. It gives up support for pagination (which shouldn't matter for the relatively small data-sets involved).

(For Option A, see #26998.)

Before

• No snapshots
• To make snapshots, you must use PHP API in the upgrade class.

After

• Some snapshots
• To make snapshots, you may use Smarty API in the *.mysql.tpl file.

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[colemanw]

I'm happy with this option if you are @totten