chore(IT Wallet): [SIW-1011] Add test toggle in user profile screen with playground entry

[hevelius]

Short description

This PR adds itwallet test toggle in user profile screen with itwallet playground entry item.

https://github.com/pagopa/io-app/assets/49342144/fcc19f4d-ff4d-492f-b147-56b9e31d03f2

List of changes proposed in this pull request

• Add new persisted preference for itwallet flag
• Update user profile screen with new toggle and an entry point in playground section

How to test

With io-dev-api-server go to user profile screen and activate IT Wallet in test environment section. Check with reacttotron if isItWalletTestEnabled is updated under persistedPreferences section. Check also if in the Playground section under user profile screen the new IT Wallet item appears.

[pagopa-github-bot]

Affected stories

• ⚙️ SIW-1011: Aggiungere feature flag locale e toggle nella sezione profilo subtask of
  • 🌟 SIW-978: Come cittadino vorrei avere ulteriori info su come ottenere i documenti sul wallet

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