Fix javascript errors that occur due to missing elements on project page

What does this MR do and why?

Fix javascript errors that occur due to missing elements on project page

• when ::Gitlab::CurrentSettings.custom_project_templates_enabled? returns false in ee/app/views/projects/_project_templates.html.haml we don't have the needed defined elements to add listeners to so we need to make the listener logic conditional.

Changelog: fixed EE: true

Screenshots or screen recordings

Before	After
	No issue

How to set up and validate locally

1. Run ee/spec/features/projects/new_project_spec.rb:149 spec on master and then on this branch.

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