feat(Proxy): use the system proxy option to always use the system proxy settings on insomnia requests

[gatzjames]

Highlights:

• Use the system option in the proxy mode in the electron session to use the system proxy settings when running network requests

Closes #7969

How to test:

• Install squid on one computer (e.g. sudo apt install squid
• Then replace /etc/squid/squid.conf config with this one:

# Squid normally listens on port 3128
http_port 3128

# Define allowed network
acl allowed_network src 192.168.1.0/24

# Define Safe Ports
acl SSL_ports port 443
acl Safe_ports port 80      # HTTP
acl Safe_ports port 443     # HTTPS
acl CONNECT method CONNECT

# Only allow requests to Safe Ports
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports

# Allow access from allowed network
http_access allow allowed_network

# Deny all other access and return 403 Forbidden
http_access deny all
deny_info 403:access_denied all

• then restart squid sudo systemctl restart squid

• next on a Windows machine, go to Properties > Proxy settings and setup a proxy pointing to the machine you are running squid on, example:
  

• and add 2 Outbound firewall rules to your windows machine (go to firewall, Advanced Firewall settings), one to block all traffic to port 80 and 443, and another to allow all traffic to squid proxy port (in default case is 3128

• next if you use latest beta or latest develop, when you login, you will get error like reported in Insomnia 10.0.0: Cannot login "Network failed" #7969
• if you use the release recurring build of this PR, it will work, you will be able to login, without configuring any proxy settings on insomnia side

[filfreire]

Tactical Approval, but actually tested, so it's a tactical blessing

[CurryYangxx]

@gatzjames Is this line useful? resolveProxy is a function but we do not call it here.

[jackkav]

Indeed this seems strange https://www.electronjs.org/docs/latest/api/session#sesresolveproxyurl