Delete report_not_configured_operational.vue and report_not_configured_operational_spec.js

The following discussion from !86840 (merged) should be addressed:

• @dftian started a discussion: (+2 comments)

  How to verify: we can't, this component is unused.

At one point we created the vulnerability report operational tab, but the report for it wasn't ready yet. report_not_configured_operational.vue was created as a placeholder so that tab would show something rather than be blank. It was added in this MR: 392efe85 where it's always passed to the operational-empty-state slot.

Implementation plan

• Delete report_not_configured_operational.vue
• Delete report_not_configured_operational_spec.js