Dashboard should report when there are errors in the product.json

[JPinkney]

Describe the bug

Right now if you create a malformed product.json in the dashboard the dashboard will attempt to load it, realize that the json is invalid, and then use the default product.json values embedded in the dashboard instead. We should have a notification that lets people know that the product.json isn't loading correctly because of it's malformed. This was originally reported in https://issues.redhat.com/browse/CRW-2176

Che version

7.34@latest

Steps to reproduce

1. Create product.json in the dashboard and add an extra comma to make the json invalid
2. Run the dashboard and observe that none of the values from the product.json you created are used, instead the default product.json values are used

Expected behavior

I would expect that the dashboard reports that the product.json is invalid so that admins know to fix it

Runtime

OpenShift

Screenshots

No response

Installation method

chectl/latest

Environment

Linux

Eclipse Che Logs

No response

Additional context

No response

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