Replace haml delete label modal

What does this MR do?

This replaces the current haml delete label modal implementation and replaces it for a Vue based one as part of the larger effort to deprecate the bootstrap based modal and use GlModal instead

#254265 (closed)

Screenshots (strongly suggested)

Before	After

Does this MR meet the acceptance criteria?

Conformity

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