Fix the qlpack json schema

[aeisenberg]

This schema was incorrectly tagging defaultSuite properties that aren't arrays as errors. The error that needs to be fixed is that the CLI leniently reads yaml. Any property that is typed as an array in the schema is also acceptable as a single element.

For example, the defaultSuite can either be an array of instructions or a single instruction.

There are also missing fields in the qlpack type, but I don't think that matters for schema validation.

Note that this fixes a bug in the test explorer where qlpacks with defaultSuite properties that are not arrays would cause the test explorer to avoid showing any test cases in that qlpack.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[koesie10]

Thanks for looking into this! I think we should be more lenient on the include/exclude properties, but the other changes look good to me.