Implement haveFirstPartyModeSettingsChanged Selector and resetFirstPartyModeSettings Action

[hussain-t]

Feature Description

Develop a selector and action in the First-party mode datastore to handle the settings state:

• haveFirstPartyModeSettingsChanged(): A selector to check if current settings differ from saved settings.
• resetFirstPartyModeSettings(): An action to revert any changes, restoring settings to their saved state.

These should integrate with existing rollback and validation processes of Analytics and Ads settings.

---

Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• A haveFirstPartyModeSettingsChanged selector should be created to compare the current First-party mode settings with the saved settings, returning true if there are unsaved changes and false if the current settings match the saved settings.
• A resetFirstPartyModeSettings action should be created to reset any unsaved changes in the First-party mode settings, restoring them to the last saved state.
• The resetFirstPartyModeSettings action should be called within the rollbackChanges process of both Analytics and Ads settings to ensure any unsaved changes are discarded when rolling back.
• The haveFirstPartyModeSettingsChanged selector should be used within the validateHaveSettingsChanged function of both Analytics and Ads settings to confirm if there are changes that need validation before saving.
• The submit button on both the Analytics and Ads settings screens should update its text to “Confirm changes” when there are validated changes, indicating that the modified settings will be saved.

Implementation Brief

Test Coverage

QA Brief

Changelog entry

[techanvil]

AC ✅