fix(spoolman): improve sanity check logic

[matmen]

Functional Changes:

• Fixes file metadata retrieval
  (we might want to move this logic into SocketActions.serverFilesMetadata to ensure a consistent behavior?)
• Fixes the printer state checks (sanity checks now only run when starting a print or changing the spool while an active print job is running)

Re-ordered some code for a clearer execution path

Closes #1408