Make ioBroker types available in the test directory

[theknut]

PR Checklist:

• Provide a meaningful description to this PR or mention which issues this fixes.
• Ensure the project builds with npm run build
• Add tests for your change. This includes negative tests (i.e. inputs that need to fail) as well as baseline tests (i.e. how should the directory structure look like?).
• Run the test suite with npm test
• If there are baseline changes, review them and make a separate commit for them with the comment "accept baselines" if they are desired changes
• If you added a required option, also add it to the template creation (.github/create_templates.ts)
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• Add your changes to CHANGELOG.md (referencing the migration description and this PR or the issue you fixed)

Description:
ioBroker types are not available in the test directory of the adapter. Adding test/**/*.ts to the root tsconfig.json makes them also available for the tests.
Fixes #1089.

** Notes **
I ran the tests and committed the changes to the tsconfig.json files. I did not see that this can be automated.