chore: remove unused SegmentedControl temp component (#29846)

## **Description**

Removes the unused temporary SegmentedControl component from
`app/component-library/components-temp/SegmentedControl`.

This also removes the stale Storybook registration entry for its story.
A reference search confirms there are no remaining app, test, or
Storybook references.

## **Changelog**

CHANGELOG entry: null

## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: temporary component cleanup

  Scenario: SegmentedControl temp component is removed
    Given the repository is on this branch
    When searching for SegmentedControl temp component references
    Then no app, test, or Storybook references are found
```

## **Screenshots/Recordings**

N/A. Code cleanup only.

### **Before**

N/A

### **After**

N/A

## **Validation**

- `rg -n "components-temp/SegmentedControl|SegmentedControl" app tests
.storybook --glob '!node_modules/**'` returned no matches.

## **Pre-merge author checklist**

- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [x] 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-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
- [ ] I've tested with a power user scenario
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics

## **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.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk cleanup that only deletes an unused temp UI component and its
Storybook wiring; primary risk is accidental removal if any downstream
consumer existed outside the searched paths.
> 
> **Overview**
> Removes the temporary `components-temp/SegmentedControl` component
entirely (implementation, types/constants, styles, tests, README, and
Storybook story).
> 
> Updates Storybook’s auto-generated `storybook.requires.js` to drop the
stale import/registration for the deleted `SegmentedControl` story.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
2b847b4. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: AndyMBridges