[build-tools] raise the simulator preview stream to 1600px and 10 Mbps

[gwdp]

Why

The preview stream is pinned to 960px and 6 Mbps because H.264 stalled at larger encode sizes. The serve-sim fixes for that are in: #167 sizes H.264 to the negotiated level, #170 recovers a stream that stops decoding, and #171 raises the level in the offer so larger frames encode at all.

Blocked by expo/serve-sim#171 — do not merge before it ships in a released @expo/serve-sim.

Linear: ENG-26485

How

• SERVE_SIM_MAX_DIMENSION: 960 -> 1600
• SERVE_SIM_VIDEO_BITRATE: 6000000 -> 10000000

Android Device Hub constants are unchanged.

Test Plan

• yarn test in packages/build-tools
• Live check on an EAS worker once serve-sim#171 ships

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.30%. Comparing base (30a3924) to head (8ca0352).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4439   +/-   ##
=======================================
  Coverage   72.30%   72.30%           
=======================================
  Files         970      970           
  Lines       46146    46146           
  Branches     9906     9906           
=======================================
  Hits        33363    33363           
  Misses      11788    11788           
  Partials      995      995           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.