Preserve more kernel parameters upon install/upgrade

[mattiascockburn]

Feature Request

Description

Currently a specific set of kernel parameters is preserved during install/upgrade no matter what: https://github.com/siderolabs/talos/blob/9b9159d1e04d337dc3a51e41be57f4795e71255d/internal/pkg/install/install.go#L180

One common way a user might also customize the running system is through the use of talos.environment parameters (settings like http(s)_proxy, no_proxy and the like). Would it be possible to include these parameters in the list of preserved parameters as well?

I know that the could also be set in a machineconfig, but this needs to be done separately.