PDJB-588: Update page content to match new Figma designs

[Bill-Haigh]

Ticket number

PDJB-588

Goal of change

Update various pages across the service to match the latest Figma designs.

Description of main change(s)

• Updates the privacy notice page: replaces 'private beta' with 'extended testing phase', updates 'Renters Rights Bill' to 'Renters Rights Act 2025', restructures data collection sections, replaces Google Analytics references with Plausible Analytics, expands data sharing and retention information
• Updates the privacy notice form page: restructures heading and inset text, adds GOV.UK One Login inset after the checkbox
• Updates form field labels and hints: changes address lookup label to 'Property name or number', changes select address heading to 'Select your address', updates email hint text
• Updates the manual address hint from 'should be' to 'must be' for England or Wales addresses
• Updates the 'You need to live in England or Wales' page: updates body text, replaces future availability paragraph with a 'go back' link, adds 'Register as a landlord' caption
• Moves the 'Register as a landlord' caption from the privacy notice page to the non-England/Wales address page
• Minor text fixes on the registration confirmation page ('Registered as landlord' to 'Registered as a landlord', 'a fine' to 'fines')
• Fixes a missing space in an HTML heading tag

Anything you'd like to highlight to the reviewer?

Checklist

• Test suite has been run in full locally and is passing
• Branch has been rebased onto main and run locally, with everything working as expected (both for your new feature and any related functionality)
• TODO comments referencing this JIRA ticket have been searched for and removed - if a future PR will address them, mention that here

[Travis-Softwire]

A few Qs, but LGTM once they're resolved