Update promo modal origins

[nalcalag]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1214600823883574?focus=true

Description

Update promo modal origins to match new specs

Steps to test this PR (Optional)

• Check origins are updated
• Check CI checks are ✅

No UI changes

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Note

Low Risk
Low risk: changes are limited to updating origin query parameter values for subscription promo modals and aligning unit tests; no logic flow or data handling is modified.

Overview
Updates the origin strings passed by CtaViewModel.getPromoCtaOnForeground for the two subscription promo modal cases to match new funnel naming specs.

Adjusts related unit tests (BrowserTabViewModelTest, CtaViewModelTest) to assert the new origin query parameter values when launching subscriptions and when recording CTA interactions.

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[nalcalag]

• Update promo modal origins #8527 👈 (View in Graphite)
• develop

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