elastic-agent install -force on Windows does not work

[strawgate]

It looks like force install might be broken on Windows.

If you run elastic-agent install on a device with installed agent it fails as agent is already installed. If you use -force it bypasses that check and sees an installed agent and calls uninstall on that agent. It finds the elastic-agent binary by using exec.LookPath(paths.BinaryName) but the elastic-agent dir isnt added to the path on Windows like it is on macOS and Linux

See:
https://github.com/elastic/elastic-agent/blob/main/internal/pkg/agent/cmd/install.go#L352-L371

Likely related to: #4965