Update DB dictionary for token_with_ivs

What does this MR do and why?

Remove model class TokenWithIv that longer exists.

With the model cass present we regenerate the ynml file, which results in losing a comment and in diff after gdk update:

diff --git a/db/docs/token_with_ivs.yml b/db/docs/token_with_ivs.yml
index 027685040736..d835dae2976a 100644
--- a/db/docs/token_with_ivs.yml
+++ b/db/docs/token_with_ivs.yml
@@ -8,4 +8,4 @@ description: TODO
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/commit/37b80b4048190c2e1a35ec399e4aeb35d511090e
 milestone: '13.9'
 gitlab_schema: gitlab_main_cell
-sharding_key_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/322592 # scheduled for removal
+sharding_key_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/322592

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