feat(ui-v2): add WorkPoolEditForm component for editing work pools

[devin-ai-integration]

Implements Phase 3 of the work pool edit page migration from Vue to React. This PR adds a form component for editing basic work pool fields.

Changes

• Add WorkPoolEditForm component with four fields:
  • Name: Disabled/read-only field displaying the work pool name
  • Description: Editable textarea (optional, 7 rows)
  • Flow Run Concurrency: Editable number input (optional, converts empty to null)
  • Type: Disabled/read-only field displaying the work pool type
• Uses react-hook-form with Zod validation
• Shows toast notifications on success/error
• Navigates to work pool detail page on successful save
• Cancel button navigates back via router.history.back()
• Export useUpdateWorkPool hook and WorkPoolUpdate type from work-pools API
• Update route component to render the form with the page header

Testing

• 16 unit tests covering form rendering, field states, submission, navigation, and error handling
• Storybook stories with MSW handlers for various scenarios (default, null values, error responses, different work pool types)

Human Review Checklist

• Verify form field behavior matches Vue implementation in prefect-ui-library/src/components/WorkPoolEditForm.vue
• Confirm API payload uses correct snake_case field names (concurrency_limit, not concurrencyLimit)
• Check that empty concurrency limit correctly converts to null for the API

Link to Devin run: https://app.devin.ai/sessions/377d92dcbb474d4a905d414d955abca4
Requested by: alex.s@prefect.io (@desertaxle)

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • closes OSS-7348
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[devin-ai-integration]

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