docs: add unit test tags flag

[o-liver]

As we use tags for the unit test files, they don't run if one does not provide the tags=unit flag to the test execution command. This change adds the description of how one is to do this when running the tests in a shell, as well as how to add it to the VS Code extension.

Changes

• [x] Documentation

[o-liver]

/it

[sonarcloud[bot]]

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