Fix vue/no-lone-template violations

What does this MR do?

Fix vue/no-lone-template violations

This rule aims to eliminate unnecessary and potentially confusing lone <template> tags in Vue components.

In Vue.js 2.x, <template> elements that have no specific directives have no effect.

In Vue.js 3.x, <template> elements that have no specific directives render <template> DOM elements as is, but in most cases this may not be what is intended.

Part of #297218 (closed).

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Screenshots (strongly suggested)

n/a

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