Adds handler for from=your-services param hint in /email/manage #1570
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In order to improve the logged-in experience, in alphagov/frontend#3670 we are redirecting /account directly to home.account.gov.uk. This means that we are skipping session creation. It improves the general logged in behaviour, but means that if someone goes to /account and logs in, then follows the link to /email/manage, email-alert-frontend will not know that the user is logged in (because no session will exist), and they'll be prompted for their email address. To get around this, we add support for a hint parameter (from=your-services) which will be added to the link in the home.account.gov.uk/your-services page. When we go to /email/manage?from=your-services, the app knows that we came from One Login and are therefore probably logged in, so attempts a silent login.
https://trello.com/c/SiAQ3dZU/2086-redirect-govuk-account-to-homeaccountgovuk