Track experimental feature toggles with analytics

[nbradbury]

Description

Closes CMM-1971

Adds analytics tracking when a user enables or disables an experimental feature. A single EXPERIMENTAL_FEATURE_TOGGLED event is fired from the setFeatureSwitchState() choke point with two properties:

• feature — the feature's prefKey (e.g., "new_stats", "rs_post_list")
• enabled — boolean indicating the new state

Also adds a debug log line for the toggle action.

Testing instructions

Verify analytics event fires on toggle:

1. Open Me → Experimental Features
2. Toggle any feature on

• Verify EXPERIMENTAL_FEATURE_TOGGLED event is tracked with enabled=true and the correct feature key

3. Toggle the same feature off

• Verify EXPERIMENTAL_FEATURE_TOGGLED event is tracked with enabled=false and the correct feature key

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Android by scanning the QR code below to install the corresponding build.

	App Name	WordPress Android
	Build Type	Debug
	Version	pr22720-490f1f6
	Build Number	1488
	Application ID	org.wordpress.android.prealpha
	Commit	490f1f6
	Installation URL	4f6vj6h8igfko

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Android by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Android
	Build Type	Debug
	Version	pr22720-490f1f6
	Build Number	1488
	Application ID	com.jetpack.android.prealpha
	Commit	490f1f6
	Installation URL	12pvf5tfbm868

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.50%. Comparing base (f22f2d3) to head (490f1f6).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #22720   +/-   ##
=======================================
  Coverage   37.50%   37.50%           
=======================================
  Files        2287     2287           
  Lines      120724   120731    +7     
  Branches    16537    16537           
=======================================
+ Hits        45275    45282    +7     
  Misses      71774    71774           
  Partials     3675     3675           

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