Add missing Netgear images (#3027)

* feat: add images to Netgear ProSafe GS510TPP

* feat: add images to Netgear GS108PEv3

* feat: add images to Netgear GS308T

* feat: add images to Netgear GS116

device-types/Netgear/GS108PEv3.yaml

@@ -4,6 +4,8 @@ model: GS108PEv3
 slug: netgear-gs108pev3
 part_number: GS108PEv3
 u_height: 0
+front_image: true
+rear_image: true
 airflow: passive
 weight: 0.54
 weight_unit: kg

device-types/Netgear/GS116.yaml

@@ -5,6 +5,8 @@ slug: netgear-gs116
 u_height: 1
 comments: '[Gigabit Unmanaged Switch Series GS116](https://www.netgear.com/business/wired/switches/unmanaged/gs116/)'
 is_full_depth: false
+front_image: true
+rear_image: false
 interfaces:
   - name: GigabitEthernet/1
     type: 1000base-t

device-types/Netgear/GS308T.yaml

@@ -8,6 +8,8 @@ airflow: passive
 comments: '[S350 Smart Switches (GS308T)](https://www.netgear.com/business/wired/switches/smart/gs308t/)'
 weight: 0.41
 weight_unit: kg
+front_image: true
+rear_image: true
 power-ports:
   - name: PS
     type: dc-terminal

device-types/Netgear/ProSafe-GS510TPP.yaml

@@ -6,6 +6,8 @@ part_number: GS510TPP
 comments: '[8-Port Gigabit Ethernet High-Power PoE+ Smart Switch with 2 Dedicated SFP Ports (190W)](https://www.downloads.netgear.com/files/GDC/GS510TPP/GS510TLP_GS510TPP_GS418TPP_DS.pdf)'
 u_height: 1
 is_full_depth: false
+front_image: true
+rear_image: true
 weight: 1.83
 weight_unit: kg
 power-ports: