Remove license checks in issuable bulk update HAML

What does this MR do?

We shouldn't do license feature checks in CE code. It turns out that this happens under the hood with project.feature_available. Let's move these checks into partials and use render_if_exists.

See #300529 (closed)

Screenshots (strongly suggested)

User > Project > issues	Group > issues	Group > MR's	Group > Project > issues	Group > Project > MR's

Does this MR meet the acceptance criteria?

Conformity

• [ ] Changelog entry No user facing change.
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

References

Related to #300529 (closed)