[Jetpack][Blogging prompts] Tags are not being fetched when tapping on `View all responses`

Expected behavior

The first time you open the app and log in, when opening the Topic screen of a tag that you were previously following using the "View all responses" button from blogging prompts "My Site" card, the tag tag will be shown as being followed.

Actual behavior

The first time you open the app and log in, when opening the Topic screen of a tag that you were previously following using the "View all responses" button from blogging prompts "My Site" card, the tag tag will be shown as not being followed. This is probably happening because before "View all responses" button on "My Site" we were not opening the tag details screen outside of the Reader screen. We might have to fetch the tags' statuses after logging in.

Steps to reproduce the behavior

1 - Start following a tag on "Reader";
1 - Install Jetpack and log in (fresh install);
2 - Without going through the Reader, select a blog site so that the blogging prompts card is shown on "My Site";
3 - Tap on "View all responses";
4 - Select the tag that you were previously following (step 1) to open the tag details screen: the tag will be shown with the "Follow" button instead of the "Followed" (shown when you're already following the tag).

Start by reproducing the fresh-install flow: follow a tag in Reader, log in, open My Site, tap “View all responses,” and open that tag. Trace how login and the Topic screen obtain followed-tag status; done when the previously followed tag shows “Followed” without visiting Reader first.