mgr/dashboard: Unify Tasks and Notifications into a sidebar

mgr/dashboard: Unify Tasks and Notifications into a sidebar

Fixes: https://tracker.ceph.com/issues/37402
Signed-off-by: Tiago Melo <tmelo@suse.com>
(cherry picked from commit 7fdb3c1504a96a991041934c8abd6453d762857d)

Conflicts:
  src/pybind/mgr/dashboard/frontend/e2e/cluster/crush-map.po.ts
  src/pybind/mgr/dashboard/frontend/package-lock.json
  src/pybind/mgr/dashboard/frontend/package.json
  src/pybind/mgr/dashboard/frontend/src/app/app.component.html
  src/pybind/mgr/dashboard/frontend/src/app/app.module.ts
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/navigation/navigation.component.html
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/notifications/notifications.component.html
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/notifications/notifications.component.scss
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/notifications/notifications.component.ts
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/task-manager/task-manager.component.html
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/task-manager/task-manager.component.spec.ts
  src/pybind/mgr/dashboard/frontend/src/app/core/navigation/task-manager/task-manager.component.ts
  src/pybind/mgr/dashboard/frontend/src/app/shared/components/components.module.ts
  src/pybind/mgr/dashboard/frontend/src/styles/popover.scss