feat: [IA-950] Customize the UI of the opt-in screen for reminders notifications

[adelloste]

Short description

⚠️ This PR depends on #4132

This PR updates the opt-in screen during the onboarding.

Please note that the switch to control notification previews is still missing here, and will be included in another PR.

User	New User

List of changes proposed in this pull request

• Updated OnboardingNotificationsPreferencesScreen
• Updated NotificationsPreferencesPreview

How to test

Describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

[pagopa-github-bot]

Affected stories

• 🌟 IA-950: Come CIT voglio potere fare l'opt-in delle notifiche di promemoria all’apertura dell’app

Generated by :no_entry_sign: dangerJS against 2375daeffa6ae48b43189be4660a2cfd512ebb67

[codecov[bot]]

Codecov Report

Merging #4130 (2375dae) into master (78fee39) will decrease coverage by 0.03%. The diff coverage is 15.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4130      +/-   ##
==========================================
- Coverage   47.63%   47.60%   -0.04%     
==========================================
  Files        1275     1275              
  Lines       25158    25181      +23     
  Branches     6583     6601      +18     
==========================================
+ Hits        11985    11987       +2     
- Misses      13123    13144      +21     
  Partials       50       50              

Impacted Files	Coverage Δ
...rding/OnboardingNotificationsPreferencesScreen.tsx	13.95% <11.76%> (-1.44%)	:arrow_down:
...ing/components/NotificationsPreferencesPreview.tsx	26.66% <12.50%> (-17.78%)	:arrow_down:
ts/components/screens/ScreenContentHeader.tsx	66.66% <100.00%> (ø)

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[dpulls[bot]]

:tada: All dependencies have been resolved !