Sync largest-series-product tests

[FraSanga]

As reported in the recurring task in this repo, I updated the tests and checked their implementation in Elixir.

Only the UUID is changed in the tests, so I believe there is nothing to do in the actual tests.

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[angelikatyborska]

The thing that changed in the reimplemented tests are the error messages: https://github.com/exercism/problem-specifications/pull/2548/files

From "span must be smaller than string length" to "span must not exceed string length". The Elixir implementation doesn't use specific error messages, just raises a generic ArgumentError, so we don't have to change anything in the tests. Thank you!