Add a CI step for config validation.

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Motivation

One major initiative in Drupal core is config validation.

Proposed Resolution

Add a ci step that uses the config_inspector drush command to check if our config schema is correct or not.

Describe the solution you'd like

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Describe alternatives you've considered

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Roles and Permissions considerations

A clear and concise description of how each of the following roles would be impacted by this change:

• Anonymous user
• Authenticated user
• Content editor
• Content administrator
• Administrator

Additional context

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