Resolve "forced disconnection can rollback in the middle of postgres request"

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [Yes]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Updates description?

Closes #86 (closed)

Before fix during postgres request:

• Forced disconnection => delete session that uniquely own transaction => delete etp transaction => postgres rollback => crash or freeze

After fix during postgres request:

• Forced disconnection => delete session sharing transaction with postgres request wrapper => unref etp transaction => postgres request finish => request wrapper unref transaction => delete transaction => postgres rollback : OK