feat(settings): Show banner when unverified accounts signin

[jonalmeida]

Because

• We want to show a banner when a user signs in after clicking an inactive account reminder email.

This pull request

• Shows a banner when we receive particular UTM params from clicking links in the inactive account emails.
• Adds metric account_banner_reactivation_success_view as custom metric.

Issue that this pull request solves

Fixes FXA-10983

Checklist

Put an x in the boxes that apply

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).

Screenshots (Optional)

Other information (Optional)

• Separated the metrics to different commit instead it's preferable to have it linked to another issue or PR.
• For testing, add the UTM params when signing in. e.g. http://localhost:3030/signin?email=tester%40gmail.com&utm_medium=email&utm_campaign=fx-account-inactive-reminder-third&utm_content=fx-account-deletion

[LZoog]

LGTM!