Add mssql.transferActiveEditorConnections setting to control automatic connection transfer (#21026)

* Initial plan

* Add transferActiveEditorConnections setting to disable connection transfer

Co-authored-by: Benjin <1609827+Benjin@users.noreply.github.com>

* Add unit tests for transferActiveEditorConnections setting

Co-authored-by: Benjin <1609827+Benjin@users.noreply.github.com>

* Fix constant value to match configuration pattern

Co-authored-by: Benjin <1609827+Benjin@users.noreply.github.com>

* cleaning up copilot

* Loc

* adding check for copyLastActive case

* adding back dacpacs

* replacing gitignore

* Typo in command

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Benjin <1609827+Benjin@users.noreply.github.com>
Co-authored-by: Benjin Dubishar (from Dev Box) <benjind@microsoft.com>
Co-authored-by: Benjin Dubishar <benjin.dubishar@gmail.com>

Author: Copilot