Rename lock issue sidebar and update its spec to remove mediator

eukorequested to merge
rename-lock_issue_sidebar into master

This is a spin-off MR of !36773 (merged)

  • Rename lock_issue_sidebar.vue to issuable_lock_form.vue
  • Remove mediator from the spec.

More context: !36773 (comment 385059729)

Edited by euko

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