Move actions from sidebar to main in Issues/Incidents/Epics

app/assets/javascripts/issues/constants.js

...ets/javascripts/issues/show/components/header_actions.vue

...pts/issues/show/components/new_header_actions_popover.vue

app/assets/javascripts/issues/show/constants.js

app/assets/javascripts/issues/show/index.js

app/assets/javascripts/right_sidebar.js

...avascripts/sidebar/components/lock/issuable_lock_form.vue

...components/subscriptions/sidebar_subscriptions_widget.vue

app/assets/javascripts/sidebar/mount_sidebar.js

app/assets/stylesheets/page_bundles/issuable.scss

app/assets/stylesheets/pages/detail_page.scss

app/controllers/projects/incidents_controller.rb

app/controllers/projects/issues_controller.rb

app/helpers/issuables_helper.rb

app/helpers/issues_helper.rb

app/helpers/merge_requests_helper.rb

app/helpers/nav_helper.rb

...erge_requests/_close_reopen_draft_report_toggle.html.haml

app/views/shared/issuable/_sidebar.html.haml

app/views/shared/issue_type/_details_header.html.haml