Fix/plugin assets sync

[aatanasov-cloudinary]

Fixes the following:

• Syncing plugin (parent) assets when they have new versions.
• Adding a version to the plugin assets to ensure no old cached assets are delivered.
• Ensuring the icons from the Cloudinary font render correctly.

Approach

• For the Cloudinary font, the css-unicode-loader package was installed to ensure such code isn't affected: content: "\e900";
• For the parent syncing issue, the following has been done:
  • Set the version to the asset URL using the get_cloudinary_version method.
  • Added a new method called sync_parent to take care of syncing parent assets.

QA notes

• Install a test plugin like this one: test-image-updated.zip. Please rename the plugin folder and the plugin name.
• Go to Cloudinary General Settings and ensure the plugin is enabled for syncing: (note the disable asset settings don't work, this issue will be addressed in another PR).
• Go to the admin page of the test plugin so Cloudinary syncs the plugin assets.
• Wait for a minute, and the images should be delivered from Cloudinary. Something like that: https://res.cloudinary.com/example-account/images/w_500/v248/cloudinary.local/wp-content/plugins/test-image-updated/example1-test-image/example1-test-image.png?_i=AA -- -v248 is the version of the plugin: 2.48
• Change one of the test images in the test plugin, but the file name must be the same.
• Increase the test plugin version.
• Go again to the admin page of the test plugin and wait for a few minutes.
• After a few minutes, the new version of the image should be available, and the version in the image URL to be changed.
• Ensure there are no debug errors.

[gabrielcld2]

Changes look good. I was able to follow the testing steps locally and can confirm the issue is fixed ✅