FiveFiftyOne - Enable snapshots for data modified data

FiveFiftyOne - Enable snapshots for data modified data

Before
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The 5.51.alpha upgrade modifies a some data-structures (`civicrm_mapping_*`, `civicrm_queue`),
but it doesn't take any snapshots.

After
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It does snapshots.

Comments
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Both tables should generally be quite small.

Strictly, the `civicrm_mapping_*` updates are more in-place modifications,
so that's more important.  The `civicrm_queue` changes are only adding new
columns.  But the table is so small - it doesn't hurt.

I suppose one could argue that these particular fields aren't likely to have
problems - but it's important to get in the habit of enabling snapshots so
that we have them when they do matter.