Remove Jetpack Lazy Images setting

[nbradbury]

Fixes #21574

As noted on this iOS PR, the Jetpack "Lazy images" setting has been removed from the backend, but we continued to show it in the apps.

This PR addresses this by removing this setting, and also adjusts the Site Accelerator screen to make more visual sense. Note that there's more to do here - our Jetpack settings are a bit of a mess - but this is a step in the right direction.

To test:

• Switch to a Jetpack site
• Go to Site settings
• Scroll down to the Performance section
• Note that there's no "Lazy load images" setting under this section
• Tap on Site Accelerator
• Note that the screen makes more visual sense(before and after below)

BEFORE

AFTER

[dangermattic]

	2 Warnings
⚠️	strings.xml files should only be updated on release branches, when the translations are downloaded by our automation.
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21575-96eb856
	Commit	96eb856
	Direct Download	wordpress-prototype-build-pr21575-96eb856.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

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

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21575-96eb856
	Commit	96eb856
	Direct Download	jetpack-prototype-build-pr21575-96eb856.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.48%. Comparing base (1fc1a55) to head (96eb856).
Report is 7 commits behind head on trunk.

Files with missing lines	Patch %	Lines
.../wordpress/android/ui/prefs/WPComSiteSettings.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #21575   +/-   ##
=======================================
  Coverage   39.48%   39.48%           
=======================================
  Files        2117     2117           
  Lines       99464    99464           
  Branches    15296    15296           
=======================================
  Hits        39269    39269           
  Misses      56714    56714           
  Partials     3481     3481           

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

[dcalhoun]

Always feels great to delete code. 🔥

[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