[v0.7.4] [HAPI-225] Socket connections are not closing

HAPI-225 Description

Fixing the issues with the sockets subscriptions that were not closing when disconnection occurs

Sub-tasks

• HAPI-226 Fix bug on BE side (#250)
  Fixing the bug

• HAPI-227 Fix bug on FE side (#251)
  Fixed the bug on FE side