Migration failure during reaction migration from gitea (go-gitea#13344)

* Migrating reactions is just not that important

A failure during migrating reactions should not cause failure of
migration.

Signed-off-by: Andrew Thornton <[email protected]>

* When checking issue reactions check the correct permission

Signed-off-by: Andrew Thornton <[email protected]>

Co-authored-by: techknowlogick <[email protected]>

Author: zeripath