Remove 'log-injection-single-file'

[jeongsoolee09]

This test case was introduced when the CAP log injection query it intends to test was at its early stage of development. This case is now obsolete since:

• It lacks a comprehensive structure of a CAP application (with package.json and a .cds file accompanying the .js file), which makes it unsuitable for testing production-grade CAP queries, and
• There are a lot of other test cases that already have the structure and serves the same purpose as this file's.

[Copilot]

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• javascript/frameworks/cap/test/queries/loginjection/log-injection-single-file/loginjection.expected: Language not supported
• javascript/frameworks/cap/test/queries/loginjection/log-injection-single-file/loginjection.qlref: Language not supported

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[lcartey]

I think you also need to update .github/workflows/javascript.sarif.expected, otherwise looks good to me.