Enable Layout/SpaceAfterColon cop for HAML

What does this MR do?

Enables Layout/SpaceAfterColon cop for HAML.

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Closes #326884 (closed)