LG-14606: Create help page for partner email change

[aduth]

🎫 Ticket

LG-14606

🛠 Summary of changes

Adds a new help article "Change the email address shared with partner agencies", as a resource for the upcoming feature release in the IdP supporting this functionality.

📜 Testing Plan

View pages for content errors. Reference original designs (see ticket) and content translations.

• English: https://federalist-17bd62cc-77b7-4687-9c62-39b462ce6fd5.sites.pages.cloud.gov/preview/gsa-tts/identity-site/aduth-lg-14606-email-change/help/manage-your-account/change-partner-email-address/
• Spanish: https://federalist-17bd62cc-77b7-4687-9c62-39b462ce6fd5.sites.pages.cloud.gov/preview/gsa-tts/identity-site/aduth-lg-14606-email-change/es/help/manage-your-account/change-partner-email-address/
• French: https://federalist-17bd62cc-77b7-4687-9c62-39b462ce6fd5.sites.pages.cloud.gov/preview/gsa-tts/identity-site/aduth-lg-14606-email-change/fr/help/manage-your-account/change-partner-email-address/
• Chinese: https://federalist-17bd62cc-77b7-4687-9c62-39b462ce6fd5.sites.pages.cloud.gov/preview/gsa-tts/identity-site/aduth-lg-14606-email-change/zh/help/manage-your-account/change-partner-email-address/

📸 Screenshots

Language	Screenshot
English
Spanish
French
Chinese

[mdiarra3]

LGTM tested in all languages and seems to look fine, works as expected.

[zachmargolis]

QQ is the alignment of the email attribute supposed to be this different across auth-only + IDV screens? Maybe they were taken at different widths?

	screenshot
auth only
idv

[aduth]

@zachmargolis I think those images were taken directly from Figma designs, not the actual implemented screens, so may have been mistakes in the original design.