feat: [SDK-4691] add native Android SDK support and refactor appium helpers

[fadi-george]

Description

Adds native Android SDK support to the Appium E2E test harness and refactors the supporting helpers to be smaller and easier to maintain. Also includes a few targeted fixes uncovered while wiring up the native Android run.

Linear: SDK-4691

Details

Native Android support

• Added feat(appium): add native Android SDK support so the existing harness can target the native Android SDK alongside the cross-platform SDKs.
• Pass the app ID to Gradle via -P props instead of hardcoded values.
• Auto-correct platform when the native Android SDK is selected.
• Apply switchToNativeContext uniformly across SDKs and unify the snackbar check via the native context.

Helper refactors (appium/tests/helpers/app.ts, selectors.ts)

• Trimmed app.ts from ~650 to ~250 lines by removing dead code, unused fast paths, and duplicated branches.
• Removed the dismissKeyboard helper and its callers, the withRetryDelay helper, and Unity-specific modal workarounds.
• Extracted waitForPushId and IAM context helpers, simplified isVisibleInViewport, checkInAppMessage, scroll helpers, and IAM trigger tap.
• Derived SdkType from a const array; hardcoded the package ID constant; always await webview visibility.

Fixes

• Clear stale UiAutomator2 state on Android between runs.
• Include bundleId in the iOS appPackageName lookup.
• Move the Flutter post-swipe pause outside the swipe loop and drop the per-scroll pause.
• Fix viewport visibility for SDK types.

Tooling and docs

• appium/scripts/run-all.sh and run-local.sh updates to support the new SDK and a new --quiet/-q flag to suppress INFO logs.
• demo/build.md clarifications to the build guide structure, test IDs, and input field docs.

Affected code

• Appium E2E test harness (appium/)
• Demo build docs (demo/build.md)
• Production SDK code

Testing

• Ran the appium suite locally against the native Android SDK and the existing SDKs to confirm parity.
• Verified 02_push.spec.ts still passes with the new waitForPushId helper.

Checklist

• Refactor only changes preserve existing behavior
• Linear ticket linked
• No breaking API changes

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