Address Ship Review issues with entitlement expiration

[quanganhdo]

Task/Issue URL: https://app.asana.com/0/1203137811378537/1206896148261286/f
Tech Design URL:
CC:

Description:

This PR addresses some Ship Review issues with entitlement expiration not being picked up by adding entitlementsDidChange and accountDidSignOut notification handling

Steps to test this PR:

1. Subscribe to PP
2. Remove sub from device
3. VPN should stop and be removed from Settings.app
4. Revoke the entitlements
5. Open another app and go back to the app
6. The app should detect the entitlement change and show messaging & stop the VPN

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than '

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 14
• iOS 15
• iOS 16

Theme Testing:

• Light theme
• Dark theme

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Internal references:

Software Engineering Expectations
Technical Design Template