Add reinstaller quick setup Maestro tests coverage and remove previous skip-onboarding tests

[catalinradoiu]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1211724162604201/task/1214735718762065?focus=true
Tech Design URL (if applicable):

Description

The returning-user "I've been here before" flow now leads to the quick setup screen (address bar position, search options, default browser, widget) instead of the old tutorial/start-browsing dialogs. The two release-blocking Maestro tests asserting the old dialog copy no longer match the app's behavior, so this replaces them with coverage of the new quick setup flow:

• preonboarding_returning_user_quick_setup_customize.yaml — selects bottom address bar position and "search only", sets DuckDuckGo as default, then taps Start Browsing and asserts the address bar renders at the bottom of the screen.
• preonboarding_returning_user_quick_setup_start_browsing.yaml — taps Start Browsing without customizing anything.

Both are gated behind a new remote config patch (remote_config_patches/enable_onboarding_quick_setup_experiment_treatment.json) that forces the onboardingQuickSetupExperimentJun3 cohort to treatment. The patch will be removed once #9181 is merged.

Steps to test this PR

Maestro cloud run: https://app.maestro.dev/project/proj_01htg54rdtfwx8rgbzv03cxkpf/maestro-test/app/app_01hkqhj1thevwtn9ym8a2ctn2r/upload/mupload_01kxngkd87e9694n996dcc2162

Maestro coverage

• Build an internal APK with the config patch applied: ./gradlew installInternalRelease -Pconfig_patches=.maestro/onboarding/remote_config_patches/enable_onboarding_quick_setup_experiment_treatment.json
• Run maestro test .maestro/onboarding/preonboarding_returning_user_quick_setup_customize.yaml and confirm it passes, including the new bottom-address-bar assertion after Start Browsing
• Run maestro test .maestro/onboarding/preonboarding_returning_user_quick_setup_start_browsing.yaml and confirm it passes

UI changes

Before	After
No UI changes	No UI changes

---

Note

Low Risk
Changes are limited to Maestro flows and nightly CI config; no production app logic.

Overview
Updates Maestro coverage for the returning-user “I’ve been here before” path now that it lands on quick setup instead of the old skip/tutorial dialogs.

Removes preonboarding_returning_user_show_tutorial.yaml and preonboarding_returning_user_start_browsing.yaml (they asserted obsolete copy). Adds preonboarding_returning_user_quick_setup_start_browsing.yaml and preonboarding_returning_user_quick_setup_customize.yaml, tagged onboardingNonReleaseBlockingTest, covering Start Browsing as-is and a customize path (address bar position, search-only, default browser) with a bottom-toolbar assertion after launch.

CI: Nightly non-blockers workflow applies enable_onboarding_quick_setup_experiment_treatment.json via -Pconfig_patches (forces onboardingQuickSetupExperimentJun3 to treatment) and runs a new Onboarding Maestro job with that tag.

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[catalinradoiu]

• Add reinstaller quick setup Maestro tests coverage and remove previous skip-onboarding tests #9200 👈 (View in Graphite)
• develop

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