This is to be more consistent as there is already a :read_note policy in
NotePolicy. To keep other behaviour the same we've introduced a
Note#noteable_ability_name that is used anywhere this was expected.

When the parent noteable is not visible to the user (e.g. confidential)
we prevent the user from adding emoji reactions to notes

When the parent noteable is not visible to the user (e.g. confidential)
we prevent the user from adding emoji reactions to notes

[master]Fixed ability to comment on and edit/delete comments on locked or confidential issues

See merge request gitlab/gitlabhq!2612

Enable frozen string in:

* app/presenters
* app/policies

Partially addresses #47424.

This prevents performing the requests, and disables all emoji reaction buttons