Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1216007250221705?focus=true
Tech Design URL (if applicable): N/A
### Description
Adds telemetry for the "hide the Return To Last Tab hatch" feature (the
feature itself is in #8998 this is the pixels/telemetry follow-up).
**Note:** I did not remove the m_ prefix to stay consistent with the
existing iOS pixels
Three user actions are now measured, each fired as a **count + daily**
pair:
- Toggled "Return To Last Tab" in *After Inactivity* settings ON/OFF
- Tapped "Don't Show This" in the hatch menu
### Steps to test this PR
_Settings toggle pixels_
- [ ] On an internal build with Android Studio logcat (or `adb logcat`
filtered for `Pixel sent:`)
- [ ] Open *After Inactivity* settings with NTP-after-idle enabled and
"New Tab Page" selected.
- [ ] Turn the "Return To Last Tab" toggle **off** →
`m_ntp_after_idle_last_tab_shortcut_setting_disabled_count_*` and
`..._disabled_daily_*` fire.
- [ ] Turn it back **on** →
`m_ntp_after_idle_last_tab_shortcut_setting_enabled_count_*` and
`..._enabled_daily_*` fire.
_Hatch menu pixel_
- [ ] With the hatch showing after an idle return, open its overflow (⋮)
menu and tap **"Don't Show This"** →
`m_ntp_after_idle_escape_hatch_hidden_from_menu_count_*` and
`..._hidden_from_menu_daily_*` fire.
### UI changes
No UI changes
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Telemetry-only wiring around existing user actions; no new product
behavior beyond firing pixels alongside current persistence calls.
>
> **Overview**
> Adds **count + daily** analytics for how users dismiss or control the
NTP “Return To Last Tab” hatch, aligned with existing
`m_ntp_after_idle_*` pixel naming.
>
> **After Inactivity settings:** toggling “Return To Last Tab” now fires
enable/disable pixels from `ShowOnAppLaunchViewModel`, backed by new
`ShowOnAppLaunchPixelName` constants and a `PixelParamRemovalPlugin`
that strips ATB from those events.
>
> **Hatch overflow menu:** choosing **Don’t Show This** now fires
`hidden_from_menu` count/daily pixels in `NewTabReturnHatchViewModel`
(still disables the hatch via `NtpAfterIdleManager` as before).
>
> Pixel registry entries were added in `ntp_after_idle.json5`; unit
tests assert the new `pixel.fire` calls on toggle and menu dismiss.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
cdc61536c36802aa40f345aa84e524aa302b5eb8. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
