UI Modernization Post: Remove post list compact layout

[zwarm]

Fixes #19340

This PR is the first in a series which will implement a new look/feel for the Post lists. This focus of this PR was to remove the "compact" layout and any associated logic. No visual changes in this PR.

Changes Include
-- Remove compact layout and drawable resources
- post_list_item_compact
- post_list_item_skeleton
- ic_view_post_compact_white_24dp
- ic_view_post_full_white_24dp
-- Remove PostListViewLayoutType
-- Remove tracking layout type changes
-- Remove saving layout type preference
-- Remove Compact class
-- Remove compact logic from PostListMainViewModel
-- Remove unused dimen resources
-- Update unit tests
-- Search view now uses the base layout

To test:

• Install and launch the app
• Login
• Navigate from My Site > Posts
• ✅ Verify that the post list works as expected
• Tap the search icon and enter a search query
• ✅ Verify that the search works as expected

Regression Notes

1. Potential unintended areas of impact
   The app crashes when navigating to posts

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Update unit tests

3. What automated tests I added (or what prevented me from doing so) N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes testing checklist: N/A

[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	pr19424-34fbe75
	Commit	34fbe75
	Direct Download	jetpack-prototype-build-pr19424-34fbe75.apk

Note: Google Login is not supported on these builds.

[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	pr19424-34fbe75
	Commit	34fbe75
	Direct Download	wordpress-prototype-build-pr19424-34fbe75.apk

Note: Google Login is not supported on these builds.

[peril-wordpress-mobile]

	Warnings
⚠️	PR has more than 300 lines of code changing. Consider splitting into smaller PRs if possible.

Generated by 🚫 dangerJS

[AjeshRPai]

Changes LGTM