Fix AGS Cascading Delete Issue

[victordibia]

Why are these changes needed?

Hey Victor, this is maybe a bug, but when a session is delete, runs and messages for that session are not deleted, any reason why to keep them?

@husseinmozannar

The main fix is to add a pragma that ensures SQL lite enforces foreign key constraints.
Also needed to update error messages for autoupgrade of databases. Also adds a test for cascade deletes and for parts of teammanager

With this fix,

• Messages get deleted when the run is deleted
• Runs get deleted when sessiosn are deleted
• Sessions get deleted when a team is deleted

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.17%. Comparing base (8c9961e) to head (49cdbaa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5804   +/-   ##
=======================================
  Coverage   75.17%   75.17%           
=======================================
  Files         176      176           
  Lines       11348    11348           
=======================================
  Hits         8531     8531           
  Misses       2817     2817           

Flag	Coverage Δ
unittests	75.17% <ø> (ø)

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[husseinmozannar]

works, tested delete session only, not delete team