Is it possible for git to use a proxy exclusively when either the VPN is active or the user is connected to the corporate network?

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Yes, it is possible to configure git to use a proxy exclusively when either the VPN is active or the user is connected to the corporate network. This can be done by modifying the git configuration file to specify the proxy server and port, and using environment variables to determine when the proxy should be used. For example, the following code can be added to the git configuration file:

[http]
proxy = http://myproxyserver:8080

[https]
proxy = http://myproxyserver:8080

Then, environment variables can be used to conditionally enable the proxy based on whether the VPN is active or the user is connected to the corporate network. For example, on a Linux system, the following code can be added to the user's .bashrc file:

if [ -n "$VPN_INTERFACE" ] || [ -n "$CORPORATE_NETWORK_INTERFACE" ]; then
  export http_proxy=http://myproxyserver:8080
  export https_proxy=http://myproxyserver:8080
else
  unset http_proxy
  unset https_proxy
fi

This code checks whether the environment variables VPNINTERFACE or CORPORATENETWORKINTERFACE are set, and if so, sets the httpproxy and https_proxy environment variables to the proxy server. If these variables are not set, the proxy is disabled.