fix: Updates to the simulations component (#28107)

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## **Description**

Updates the copy, layout and text color for 3 scenarios: No changes,
Generic Error and Fiat value not available as per design review.

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## **Related issues**

Fixes: #27072

## **Manual testing steps**

1. Go to this page...
2.
3.

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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<img width="359" alt="Screenshot 2024-10-25 at 14 52 54"
src="https://github.com/user-attachments/assets/df189f0b-01c0-4f47-a59c-2e323fe6c8b3">

<img width="472" alt="Screenshot 2024-10-30 at 16 31 01"
src="https://github.com/user-attachments/assets/f57f1d95-aeb2-4900-ab9e-14fe448bcf68">

<img width="361" alt="Screenshot 2024-10-25 at 14 14 19"
src="https://github.com/user-attachments/assets/367e9351-3e81-4b42-8ec6-3f53a2e73f08">


## **Pre-merge author checklist**

- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.