Add floating-point scenario to 'triangle'

The exercise ‘triangle’ has a couple tests for floating-point numbers. The comments already state a language track may treat these differently. There is a floating-point scenario too, but these tests are not marked with it.

Thanks to Erik for suggesting to add the scenario. This will enable me to feature-gate these tests on the Rust track for people who choose to take on the additional challenge.

PR:

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