Add pixel instrumentation for "Get Desktop Browser"

[catalinradoiu]

Task/Issue URL: https://app.asana.com/1/137249556945/project/72649045549333/task/1213194326544099?focus=true

Description

Added pixels for the "Get Desktop Browser" feature across all user interaction points.
Added pixels for:

• “Get Dekstop Browser” impression in “Complete setup"
• “Get Desktop Browser” settings clicked
• “Get Desktop Browser” modal dismissed
• Link clicked and “Share link” button clicked

Also defered reading/ writing for getDesktopBrowserSettingDismissed from SettingsDataStore to io dispatcher.

Steps to test this PR

PixeLs

• Navigate to Settings and verify impression pixel fires when "Get Desktop Browser" appears in complete setup
• Click "Get Desktop Browser" from complete setup section and verify click pixel with "complete_setup" source
• Click "Get Desktop Browser" from bottom settings and verify click pixel with "settings" source
• In the modal, click "Share Download Link" and verify share pixel fires
• Click the browser URL link and verify link click pixel fires
• Click "No Thanks" and verify dismissal pixel with "no_thanks" source
• Hide the complete setup item via menu and verify dismissal pixel with "hide” source

Also the functionality for dismiss, share, hide should work as before.

UI changes

No UI changes

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Note

Low Risk
Mostly adds analytics pixel firing and moves a few SettingsDataStore reads/writes onto IO dispatchers; behavior should be unchanged aside from extra async work in UI/receiver code.

Overview
Adds full pixel instrumentation for the Get Desktop Browser funnel, including impression (when the complete-setup item is shown), clicks (with source of settings vs complete_setup), dismissals (with source of no_thanks vs hide), and modal actions for share and link-copy.

Updates settings/desktop-browser code to fire these pixels and to perform getDesktopBrowserSettingDismissed reads/writes on the IO dispatcher (including making the share broadcast receiver asynchronous via goAsync), and extends pixel definitions/enum plus ATB-parameter removal and unit tests to cover the new events.

^{Written by Cursor Bugbot for commit 6e4d330. This will update automatically on new commits. Configure here.}

[catalinradoiu]

• Add pixel instrumentation for "Get Desktop Browser" #7786 👈 (View in Graphite)
• develop

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[github-actions]

Privacy Review task: https://app.asana.com/0/69071770703008/1213345628793030

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[cursor]

BroadcastReceiver missing exception handling for pendingResult

Medium Severity

The pendingResult.finish() call lacks try-finally protection. If settingsDataStore.getDesktopBrowserSettingDismissed = true throws an exception, pendingResult.finish() never executes, causing the broadcast to hang for up to 10 seconds before timing out. The codebase has a goAsync() helper function (visible in VpnReminderReceiver.kt) that wraps pending result completion in try-finally, but this receiver doesn't use it.