Add new magnet axes

[somebody1234]

Pull Request Description

• Closes Output type displays below other nodes #8460

  • Add new magnet axes 32px below the bottom of the previous node, and 32px above the top of the next node

• Fix a bug where magnet alignment and "zoom to all" take into account nodes that no longer exist

• Fix a bug where "zoom to all" breaks completely right after deleting a node

Important Notes

• Snapping with bounded cross axes were discussed during refinement, but are out of scope of this PR.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.