GUI: Script Generator actions and global parameter values disappear after reloading the page

### Description
As a user of Script Generator, I don't want my Action Table or Global Parameters to disappear after reloading Script Generator if the Script Generator Python process crashes.

### To reproduce:
- Open script generator (in standalone mode or from IBEX GUI),
- Add an Action to the Action Table (additionally you can set a global parameter too)
- Delete the Python process that the Script Generator is using
- Wait for the Reloading Screen to disappear (it might take few seconds)
- You will see that the Action Table is empty after reloading

This bug was discovered while fixing the Standalone Script Generator is stuck at reloading bug, see ticket here:[#6690]

### Acceptance Criteria:
- After reproducing the steps, actions and global parameter values remain after reloading
- Add a Squish test for this
- This behaviour is consistent when ran from IBEX GUI as well as standalone