Replaces v-html with gl-sprintf in ee/app/assets/javascripts/vue_merge_request_widget/components/merge_immediately_confirmation_dialog.vue

What does this MR do?

Replaces v-html with gl-sprintf in ee/app/assets/javascripts/vue_merge_request_widget/components/merge_immediately_confirmation_dialog.vue to remove v-html in the file.

Screenshots

n/a

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Style guides
• Separation of EE specific content

Closes #241932 (closed)