feat: unstacking the exposure chart.

[rodrigoi]

Important

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Problem

A little update to unstack the exposure time series data. It looks cumulative when it's not.

Changes

Before	After

Does this work well for both Cloud and self-hosted?

How did you test this code?

[greptile-apps]

PR Summary

This PR modifies the Exposures component to unstack the experiment exposure chart, displaying independent line series instead of stacked areas for better data representation.

• Changed fill: true to fill: false in the dataset configuration to remove area filling under lines
• Removed stack: 'stack1' property from the dataset configuration to prevent stacking
• Removed stacked: true from the y-axis scale configuration to ensure independent series display
• Maintained accurate tooltip description that correctly refers to "daily cumulative count of unique users"

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📸 UI snapshots have been updated

4 snapshot changes in total. 0 added, 4 modified, 0 deleted:

• chromium: 0 added, 4 modified, 0 deleted (diff for shard 7)
• webkit: 0 added, 0 modified, 0 deleted

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Size Change: +74 B (0%)

Total Size: 13.2 MB

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Filename	Size	Change
frontend/dist/toolbar.js	13.2 MB	+74 B (0%)

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[andehen]

Nice! I think this is better. If the distributions are similar, it's easy to spot that the rollout behave as it should if they are exactly similar. If it's stacked, it's not.

But not a strong opinion though, if anyone disagrees.

(and as we talked about, putting this under a tab makes sense. I think results should be the first the user sees)