[BUILD-965] fix: Don't make unnecessary requests from reviewer, other…

… fixes (#1070)

* ref: Simplify update_tabs function

* Change code for changing page and updating header

* ref: Simplify showing chatbot

* ref: Remove ReviewerSidebar.set_resource_type

* ref: Separate page type from resource type

* ref: Move comment

* ref: Remove not needed function

* ref: Move ReviewerSidebar.show_chatbot method

* ref: Rename _show_resources_for_current_card

* fix: Show chatbot note not found page

* Don't make request to chatbot when other page is open

* fix: Handle auth failure when switching between cards