Remove incorrect localVue usage in ee/spec

What does this MR do?

As described in &2360 (closed), cleans up our Jest tests from unnecessary localVue usage

Involved specs

• ee/spec/frontend/alerts_service_settings/components/alerts_service_form_spec.js
• ee/spec/frontend/clusters/components/environments_spec.js
• ee/spec/frontend/notes/components/note_actions_spec.js
• ee/spec/frontend/operations/components/dashboard/project_header_spec.js
• ee/spec/frontend/subscriptions/new/components/checkout/progress_bar_spec.js
• ee/spec/frontend/subscriptions/new/components/checkout/subscription_details_spec.js

Conformity

• Merge request performance guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

Closes: #196067 (closed)