Clean unnecessary 'localVue' in 'ee/spec/frontend/ide'
## Summary
As described in https://gitlab.com/groups/gitlab-org/-/epics/2360, we need to clean up our Jest tests from unnecessary `localVue` usage. In `ide` we have mostly an actual `localVue.use` but we need to clean up `localVue.extend` usage as it's an overkill for mounting a component.
## Risks
No risks
## Involved specs
- [ ] ee/spec/frontend/ide/components/ide_status_list_spec.js - only extend
- [ ] ee/spec/frontend/ide/components/panes/right_spec.js - only extend
- [ ] ee/spec/frontend/ide/components/terminal_sync/terminal_sync_status_safe_spec.js - only extend
- [ ] ee/spec/frontend/ide/components/terminal_sync/terminal_sync_status_spec.js - only extend
- [ ] ee/spec/frontend/ide/components/terminal/session_spec.js - only extend
- [ ] ee/spec/frontend/ide/components/terminal/terminal_controls_spec.js
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