Go: Reinstate dummy test so consistency tests are run

[owen-mc]

This reverts commit 38cb6e5.

This is needed so that the consistency checks are run on go/ql/test/consistency/, otherwise we don't check that go/ql/test/consistency/CONSISTENCY/UnexpectedFrontendErrors.expected is correct.

[Copilot]

Pull request overview

This PR reverts a previous commit to reinstate a dummy test file that ensures consistency checks are executed for the Go language tests. Without this dummy query, the test framework would not run the consistency checks in go/ql/test/consistency/, leaving the UnexpectedFrontendErrors.expected file unvalidated.

• Reinstates dummy.ql with a minimal query that triggers test execution
• Adds corresponding dummy.expected file with the expected query output

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
go/ql/test/consistency/dummy.ql	Adds a simple dummy query that outputs a string to ensure the test framework processes this directory
go/ql/test/consistency/dummy.expected	Adds the expected output for the dummy query

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