R1:c7a84876c9a6

Add some missing rendering code to textual feed stories

Summary: Ref T2852. Token given stories currently try to `strip_tags()` a `PHUIFeedView` or similar, which doesn't work. Cast it to a string before stripping. This is super gross but I don't want to clean it up until after ApplicationTransactions so we can really clean up all of Feed.

Test Plan: Ran `bin/feed republish <id>` on a feed story about giving a token to a revision.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

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