Fixes #9763

Note: This branch is based on #9764.
Merge instructions

1. Review and Merge Inflate post list menu item from xml instead of adding it dynamically #9764
2. Update the target branch to feature/post-filters-compat-view-toggle
3. Review and Merge this PR

Updates the loading skeleton for the compact view layout type on post list screen.

To test: - you might want to change the network type to EDGE so it takes a while before the items are fetched

1. Clear app data or switch to a site for which you haven't loaded posts yet
2. My Site
3. Blog Posts
4. Notice loading skeletons are being displayed
5. Click on the "toggle rows layout" - change it to compact layout
6. Scroll and observe the compact version of the loading skeleton is being displayed

Update release notes:

• There is no need to update the release-notes as the feature hasn't been released yet

Note - This code was mostly developed by @onepointsixtwo in #9733, but the fork of the repo was deleted before we merged the PR.