Adding error variant to Ic-Stepper

Summary

Adding error and warning options for Ic-Stepper

💬 Description

Currently Ic-Stepper only has blue for current and green for success. Adding options for error and warning to reflect the state of that page.

💰 Use value

It will help give it more functionality and allow for users to clearly see if there are warnings or errors on certain pages. Increases the usability of steppers and users can clearly see which pages have issues. Users don't have to click through the pages to see issues, they can simply tell from the stepper that a certain page has issues.

📝 Acceptance Criteria

If a page has required fields for example and they haven't been filled but other boxes on that page perhaps have been filled, the stepper should indicate theres an error on that page.
If a page has a reason to showing a yellow alert, then in the stepper that page icon should indicate warning.

✏ Designs

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## 🧾 Guidance
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Additional info

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