[quick_actions] Remove usesCleartextTraffic

[mboetger]

Removes deprecated usesCleartextTraffic.

Addresses: #182553

Pre-Review Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
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[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request updates the Android configuration for the quick_actions example app's debug build. It replaces the deprecated android:usesCleartextTraffic attribute with a networkSecurityConfig file. This change maintains the ability for cleartext traffic in debug mode, which is necessary for Flutter development tools, while using the modern Android configuration approach. I have provided one suggestion to improve the security of this new configuration by restricting cleartext traffic to only necessary local domains.

[stuartmorgan-g]

test-exempt: configuration change

[stuartmorgan-g]

LGTM

[mboetger]

No changelog needed - configuration change for example app.