Validate specs struct with go-playground/validator library to validate external configuration

[BarcoMasile]

Description

Right now external configuration in Admin UI is not validated. we need to make sure it's ok validating it right away using the validator library we already use in the project.

This is needed to avoid weird errors at runtime or during the setup of the backend server.

This should be done in the serve.go file.
We should validate the EnvSpecs object, right after applying the needed validation tags in specs.go.

The whole process of "preparing" the specs object could be (strongly advised) grouped in a single function that is invoked inside the serve() method.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/IAM-925.

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