Enable Style/Semicolon in Rubocop for HAML

What does this MR do?

Enables Style/Semicolon cop in Rubocop for HAML files.

Part of #23855

Blocked by !59069 (merged)

Screenshots (strongly suggested)

n/a

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have not included a changelog entry because ~"technical debt" in static code analysis, which does not change any frontend.
• Code review guidelines
• Style guides
• Separation of EE specific content

Part of #23855