[Paywall Experiment] Set AB Experiment for 7.78

[mebarbosa]

Description

• We had to postpone again the AB experiment for 7.78 instead of 7.77 due an issue that we found that we were not collecting data for AA experiment. See for more context: p1730987811857399/1729729858.793479-slack-C046HLX37K2
• This PR replace the AA experiment for AB experiment

Fixes #3142

Testing Instructions

Code review is fine

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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