Error when configuration is invalid

[QuLogic]

Description:
When setting up this action, I accidentally forgot the changed-files key in my labeler.yml, i.e., I had something like:

label:
  - any-glob-to-any-file: ['some/file/name']

instead of:

label:
  - changed-files:
    - any-glob-to-any-file: ['some/file/name']

The result was that this action just printed out:

An unknown config option was under label: any-glob-to-any-file

and returned success.

Instead, it should error so that one knows that the configuration is broken.

Justification:
Silent failures lead to people assuming things are "working fine" when they are not, and thus never investigate an issue.

Are you willing to submit a PR?
Maybe, but I don't really know TypeScript.

[HarithaVattikuti]

Hello @QuLogic
Thank you for creating this feature. We will investigate it and get back to you as soon as we have some feedback.