available_on_device added to API Call multiple times

[beatjoerg]

NetBox version

v3.0.0

Python version

3.9

Steps to Reproduce

1. Edit an Interface on a device
2. Look at the API-Call: /api/ipam/vlans/?available_on_device=3&brief=true
3. Cancel edit
4. Edit an Interface on a device again
5. Look at the API-Call: /api/ipam/vlans/?available_on_device=3&available_on_device=3&brief=true
6. Repeat step 3 to 5 multiple times. Every time available_on_device is added again. Seems to be cached in code and not reset on every request.

Expected Behavior

Parameter "available_on_device" only appears once
/api/ipam/vlans/?available_on_device=3&brief=true

Observed Behavior

If the steps are repeated many times the URL of the API call gets too long.

[beatjoerg]

Issue seems to related to this code line:
https://github.com/netbox-community/netbox/blob/develop/netbox/utilities/forms/widgets.py#L197
@thatmattlove

[beatjoerg]

Fix do not resolve the issue completely..
If I edit after restart lets say device with id=3 then /api/ipam/vlans/?available_on_device=3&brief=true is constructed
If I edit then device id=1 the API call is still /api/ipam/vlans/?available_on_device=3&brief=true (I expect available_on_device=1), only a restart of django resolves the issue.

Why is
current = self.static_params[key]
self.static_params[key] = [v for v in set([*current, value])]
required?
It seems that it is not per GET request, it remains for the full time of the codebase is running.