extension/src/goTest: save only dirty files

[tamayika]

Fixes #3837

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Ethan Reesor:

Patch Set 1: Commit-Queue+1

(1 comment)

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-08-15T16:49:10Z","revision":"df00d01e6c010b7109738d9f22602ab287eb78b1"}

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Message from Ethan Reesor:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Hongxiang Jiang:

Patch Set 1: Code-Review+2

(3 comments)

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[gopherbot]

This PR (HEAD: 2d7676b) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/vscode-go/+/696355.

Important tips:

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[gopherbot]

Message from yika tama:

Patch Set 2:

(3 comments)

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Message from Carlos Amedee:

Patch Set 4: Code-Review+1

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This PR is being closed because golang.org/cl/696355 has been merged.