expose no_public to sample_template_checks

[antgonza]

No description provided.

[coveralls]

coverage: 92.928%. remained the same
when pulling b2fd1da on antgonza:sample_template_checks-no_public
into aac0ec7 on qiita-spots:dev.

[antgonza]

Before this change, the "delete samples" function will create a new job that will fail like this:

Now, it will fail with this before creating the job:

[wasade]

Looks good!