fixed PY-14360Shift+enter stopped to work in "Run manage.py task..." dialog

there is no need to register shift+enter in plugin.xml for ipnb, we already registered it as custom shortcut on code source panel

(cherry picked from commit d0a4c002f83ffb36817982d185ecf2643a650b56)
Allow to turn scratch on in properties (PY-14625).

(cherry picked from commit c54961bdbc7ec94466fbfbd622a0b99e6389d5c4)
fix PY-14506 Deadlock during debugging of PyQt5 application

(cherry picked from commit d87d75a412013c54d6bf3855078f0272518f17eb)
add tests for PyQt debugging

(cherry picked from commit 381ef3565f3e30dab2179966cc503b9202c09312)
Fix console connection for remote interpreter (PY-14564).

(cherry picked from commit c8d5778dbe719792da5190ec220a25e70b877e47)
Better error reporting.

(cherry picked from commit ffa0e5de4f5e6bb0ab8361a6e714e17df61987dc)
Rebuild debugger variables view on console command execution (PY-14592).

(cherry picked from commit e884dd0e0434c769019ea1a117f2e58c5e60a7f3)