Feeds and feeds log listing routes are not marked as admin routes

Problem/Motivation

Feeds Log listing route : /feed/{feeds_feed}/log,
log detail route : /feed/{feeds_feed}/log/{feeds_import_log} ,
feeds item listing route: and /feed/{feeds_feed}/list are not marked as admin routes, causing inconsistent admin theme rendering.

Steps to reproduce

Enable feeds module and import a feed.
edit the feed item under feeds, click on "item" tab. Then we can see the admin theme is not reflecting

Enable the feeds log module.
Import feeds
edit feeds and click on log -> UI is not rendering as per admin theme

click on the "view entries" button in the log listing page -> UI is not rendering as per admin theme

Proposed resolution

Add _admin_route: TRUE to Feeds Log routes.