Feature: support diff output comparison

[Hotell]

originally created within fluent repo microsoft/fluentui#27910

Describe the feature that you would like added

it would be very helpful if we could store actual bundle snapshots and provide a diff view on github or locally.

today we have this UI

proposed addition would contain a link that would show diff, or just download the diff assets - so one can review it locally

Have you discussed this feature with our team

@layershifter

Additional context

Validations

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