debug: respect go test flags usage

[luoxiaohei]

The go test require the package list appear before any flag unknown to the go test command.
But vscode-go constructs arguments for the go test call with testify that doesn't respect the usage.
This PR fixes this problem by filling in the package list first.

Fixes: #1831

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[rickbatka]

This was never merged. #1831 is still open. It really looks like this will fix it. Any chance of some help form the team here?

[dharmab]

I also ran into this issue, on a CGO project which requires ldflags+extflags on macOS. The impact is that my project cannot test or debug tests on VSC on macOS.