Use DSL method in JiraProjectsResolver

What does this MR do?

This is a simple refactoring MR that uses the AuthorizeResource provided DSL in favour of re-implementing the exact same functionality manually.

This change has no functional effects, and is solely developer facing.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry - unnecessary
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. Not necessary, since this MR does not change behaviour. Existing tests suffice.