Persist Change Bundle Location host setting

[Phecda]

Summary:

Persist Change Bundle Location updates to the same debug_http_host preference used by the Android Dev Settings screen.

Previously, Change Bundle Location only updated the in-memory PackagerConnectionSettings host override. After killing and restarting the app process, the host was read again from SharedPreferences, so the change was lost.

Changelog:

[ANDROID] [FIXED] - Persist Change Bundle Location debug server host changes

Test Plan:

Verified with RNTester debugOptimized on Android:

1. Installed and launched RNTester on a physical Android device.
2. Opened the React Native Dev Menu.
3. Changed the bundle location using Change Bundle Location.
4. Killed and restarted the app process.
5. Confirmed the updated host is still used after restart.

[Abbondanzo]

This is actually leftovers from a migration away from persisting the bundle location to disk (#54139). The shared preferences read is only there for legacy reasons, but given that iOS is still writing to disk I think it's fine to reintroduce such a change. Left a few review comments to fix up first

[Abbondanzo]

Nit: rather than storing a null string, can you have this remove the string altogether?

[Phecda]

Thanks, updated. I was following what Dev Settings does here, since the EditTextPreference for debug_http_host seems to persist an empty string when cleared. But yeah, removing the key is cleaner for this path since we already treat missing and empty the same when reading it back.

[Abbondanzo]

The preferences should be cleared here too, but the constructor would have to updated to not call this method and blast this away each time

Suggested change

	preferences.edit().remove(PREFS_DEBUG_SERVER_HOST_KEY).apply()
	_cachedOrOverrideHost = null

[meta-codesync]

@Abbondanzo has imported this pull request. If you are a Meta employee, you can view this in D110990504.