Remove new post list experimental feature flag

[nbradbury]

Description

Removes the RS_POST_LIST experimental feature flag and makes the new post list the default for any site with an application password.

Testing instructions

New post list rollout:

1. Log into a site that has an application password
2. Open the site's post list.

• Verify the new post list UI is shown.

Legacy post list fallback:

1. Log into a WP.com site that does not have an application password.
2. Open the site's post list.

• Verify the legacy post list UI is shown.

Experimental features screen:

1. Open Settings → Experimental Features.

• Verify the "New Post List" entry is no longer present.

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[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	pr22925-60d1eed
	Build Number	1493
	Application ID	org.wordpress.android.prealpha
	Commit	60d1eed
	Installation URL	5faotohn2kbhg

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[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	pr22925-60d1eed
	Build Number	1493
	Application ID	com.jetpack.android.prealpha
	Commit	60d1eed
	Installation URL	5d3t9ggllcfho

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 37.32%. Comparing base (1fe1291) to head (60d1eed).
⚠️ Report is 1 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...ava/org/wordpress/android/ui/ActivityLauncher.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #22925      +/-   ##
==========================================
- Coverage   37.32%   37.32%   -0.01%     
==========================================
  Files        2320     2320              
  Lines      124722   124714       -8     
  Branches    16954    16953       -1     
==========================================
- Hits        46551    46547       -4     
+ Misses      74409    74405       -4     
  Partials     3762     3762              

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[adalpari]

LGTM!

[wpmobilebot]

🤖 Build Failure Analysis

This build has failures. Claude has analyzed them - check the build annotations for details.