docs: add snapshot details to frontend style guide

[chris-at-jobber]

Motivations

@darryltec answered a question on a PR with enough context that I thought it made sense to write down for the future. Maybe this is "automatable" but until then it should live somewhere we can reference.

Changes

Added

• Details of why to avoid snapshots to the Atlantis style guide

Testing

• Go to Guides > Frontend Style Guide > Tests

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