Authorize access before serving project template

Previously, if a user was a guest member of a private project, they
could access the merge request template as we were not checking
permission-levels of the user.

When a issue template is asked for, the user must have :read_issue for
the project; or :read_merge_request when a merge request template is
asked for.

We also now rescue_from FileNotFoundError and handle as 404. This is
because RepoTemplateFinder can raise a FileNotFoundError exception,
which Rails previously handled as a 500.

Handling these in a way that is consistent with
ActiveRecord::RecordNotFound exceptions, within controllers that
inherit from Projects::ApplicationController at least, and returning a
404.

https://gitlab.com/gitlab-org/gitlab-ce/issues/54943

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