Test io-pack against Schema

[foxriver76]

We could test the io-package against the current Schema, then we have our single point of truth in Schema and only need to test stuff which cannot be validated by the schema additionally

Extended test cases to test io-package.json against the schema https://github.com/ioBroker/ioBroker.js-controller/blob/master/schemas/io-package.json

This ensures that an error not addressed or detected in VSCode or a similar environment does not result in a release on GitHub and NPM.
It also prevents additional implementation effort for checks in the repochecker.

To implement this, we can use this package https://www.npmjs.com/package/jsonschema

testing/src/tests/packageFiles/index.ts

Line 135 in 764da3d

describe(`Check contents of io-package.json`, () => {

[AlCalzone]

We may have to "translate" some errors then, but I like it.

[mcm1957]

adapter checker implements this check now and outputs very clear messages.
Was implemengted by copilot.

see https://github.com/ioBroker/ioBroker.repochecker/blob/173b7abdd2334107ef05a23b1514c4759733441b/lib/M100_IOPackageJson.js#L101