site-kit-wp: Return full stops back to the insufficient permissions error description

Bug Description

Steps to reproduce

1. Go to ‘…’
2. Click on ‘…’
3. Scroll down to ‘…’
4. See error

Screenshots

Additional Context

• PHP Version:
• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Plugin Version [e.g. 22]
• Device: [e.g. iPhone6]

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Acceptance criteria

• The error message from the getInsufficientPermissionsErrorDescription function should always have individual sentences separated from each other with a full stop.
• At the same time, it should still ensure that the last sentence does not end in a full stop, per our UX guidelines (text with 1 or 2 sentences should not end in a full stop).

Implementation Brief

• Using assets/js/util/insufficient-permissions-error-description.js,
  • Add a full stop, . at the end of every message.
  • Before returning the complete string from the function, check:
    • if userInfo is empty and remove the last . from message.

Test Coverage

• Add tests for getInsufficientPermissionsErrorDescription.

QA Brief

Changelog entry

• Add full stops to the insufficient permissions error description.