docs: fixed database scaling docs. Fixes #4281

ux: fix bug where saving empty issue tracker form was causing exception, fixes: #4278

release: merge back stable branch into default

Added tag v4.4.2 for changeset d2514226abc8

release: Finish preparation for 4.4.2

release: updated pip2nix output for 4.4.2

release: Start preparation for 4.4.2

docs: updated changelog for 4.4.2

packaging: updated RhodeCode Tools to 0.10.2 - fixes the urllib3 packaging problem

integrations: fix bug with integrations view page not loading when non global admin tries to access it, fixes #4266