Add runtime config support to email in-context signup webview

[amddg44]

Task/Issue URL: https://app.asana.com/0/414235014887631/1206881234663275/f
Tech Design URL:
CC:

Description:
Implements the required getRuntimeConfiguration for autofill script for the in-context email webview. Also adds Autofill debug menu option to reset the InstallDate to 0

Steps to test this PR:

1. If signed in to Email Protection, sign out first (Settings > Email Protection > scroll down to Sign Out)

2. Visit https://fill.dev/form/registration-email and tap the grey dax icon to trigger the in-context signup flow.
   Note: if you don't see the grey dax icon in the email field, go to Settings > All debug options > Autofill Settings and tap the two Reset rows in the Email Protection and reload the webpage
   

3. Follow the sign up flow to create a new duck address and confirm it completes successfully, prompting to fill your newly created address or a private duck address like so:
   

4. Sign out of email protection and tap the Reset Email Protection InContext Signup Prompt in debug settings

5. Reload the webpage and tap the grey duck icon again

6. This time follow the sign-in flow and confirm it completes successfully also

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

[aataraxiaa]

Validated and LGTM 🚀