Fixes for unreachable project issues when transfer repository from organization ...

Fixes for unreachable project issues when transfer repository from organization (#31770) (#31828)

Backport #31770 by @emrebdr

When transferring repositories that have issues linked to a project
board to another organization, the issues remain associated with the
original project board. This causes the columns in the project board to
become bugged, making it difficult to move other issues in or out of the
affected columns. As a solution, I removed the issue relations since the
other organization does not have this project table.

Fix for #31538

Co-authored-by: Edip Emre Bodur <emrebdr29@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>