Implement auto-open of next task after closing the previous one

[Abdu-moustafa]

PR-Description: should contain all the information necessary for an outsider to understand the change without looking at the code or the issue!

• Why the change is necessary
• What the goal of the change is
• How change is achieved (e.g. design decisions)
• The author should advertise and sell the change in the PR body

Screenshot: whenever useful, but only as a visual aid.

Definition of Done: https://4teamwork.atlassian.net/wiki/spaces/CHX4TW/pages/917562/

For [TI-XXXX]

Checklist

Everything has to be done/checked. Checked but not present means the author deemed it unnecessary.

• Changelog entry
• Link to issue (Jira or GitHub) and backlink in issue (Jira)

Only applicable should be left and checked.

• Upgrade-Steps:
  • SQL Operations do not use imported model (see docs)
  • Make it deferrable if possible
  • Execute as much as possible conditionally
  • DB-Schema migration
    • All changes on a model (columns, etc) are included in a DB-schema migration.
    • Constraint names are shorter than 30 characters (Oracle)
• API change:
  • Documentation is updated
  • API Changelog entry (see guide)
  • If breaking:
    • api-change label added
    • #delivery channel notified about breaking change
    • Scrum master is informed
• Bug fixed:
  • Resolved any Sentry issues caused by this bug
• New functionality:
  • for document also works for mail
  • for task also works for forwarding
• Further improvements needed:
  • Create follow-up stories and link them in the PR and Jira issue
• Change could impact client installations, client policies need to be adapted
• New translations
  • All msg-strings are unicode
• Change in schema definition:
  • If missing_value is specified, then default has to be set to the same value