fix: use measured header height when exposing it

[satya164]

Motivation

Currently the useHeaderHeight hook returns a hardcoded value since previously we didn't have a way to measure the header height. But now there's a onHeaderHeightChange listener that we can use to measure the accurate height.

This PR makes sure that we use this event when measuring header height.

Test plan

Tested in the example app:

Simulator.Screen.Recording.-.iPhone.15.-.2024-03-28.at.12.31.23.mp4

[github-actions]

The Expo app for the example from this branch is ready!

https://expo.dev/@react-navigation/react-navigation-example?serviceType=eas&distribution=expo-go&scheme=exp+react-navigation-example&channel=pr-11917&sdkVersion=50.0.0

[netlify]

✅ Deploy Preview for react-navigation-example ready!

Name	Link
🔨 Latest commit	8438e40
🔍 Latest deploy log	https://app.netlify.com/sites/react-navigation-example/deploys/66070fe6c93a1e00081cf24f
😎 Deploy Preview	https://deploy-preview-11917--react-navigation-example.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 34.48276% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 77.05%. Comparing base (1d5ee6e) to head (78e7d29).

❗ Current head 78e7d29 differs from pull request most recent head 8438e40. Consider uploading reports for the commit 8438e40 to get more accurate results

Files	Patch %	Lines
.../native-stack/src/views/NativeStackView.native.tsx	33.33%	16 Missing ⚠️
packages/native-stack/src/utils/debounce.tsx	40.00%	3 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11917      +/-   ##
==========================================
- Coverage   77.24%   77.05%   -0.20%     
==========================================
  Files         209      210       +1     
  Lines        6312     6336      +24     
  Branches     2496     2506      +10     
==========================================
+ Hits         4876     4882       +6     
- Misses       1382     1400      +18     
  Partials       54       54              

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