Filter javascript chains from available operations on Web Services filters

The Web Services Filtering is sligthly broken.

Step to reproduce:

• create a javascript automation
• go to modeler > advanced settings > Web Services Filtering
• click on create
• click on add chain

=> the modal displays all the configurations made in studio: schemas, doc types ...

• select a chain (javascript) and click on OK

=> nothing happens

it works with a regular automation chain

Expected:

• Automation scripts shouldn't appear when using the "add chain" button (currently it is displayed, that's the bug to fix)

Further context to help checking for regressions:

• Any chain you create should appear when using the "add chain" button.
• You can include your automation script inside any chain, but even if you do that the script itself still should not appear when using the "add chain" button, only the automation chains.