allow args.background parameter for go.test.* commands

[leep-frog]

Fixes golang/vscode-go#3154

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[leep-frog]

I just filled out the CLA. Doesn't look like I have permission to re-run checks though :(

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

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Patch Set 1:

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[gopherbot]

This PR (HEAD: 38b4cbb82102283237621d9106b41e3ef9ebc7df) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/vscode-go/+/567995.

Important tips:

• Don't comment on this PR. All discussion takes place in Gerrit.
• You need a Gmail or other Google account to log in to Gerrit.
• To change your code in response to feedback:
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  • Respond to each comment by marking as Done in Gerrit if implemented as suggested. You can alternatively write a reply.
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• See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.