Provide information about dependencies in health endpoint

[tomkerkhove]

Provide detailed information about the health of scraper and its dependencies in health endpoint.

Specification

Tasklist

• Provide insights on our dependencies
  • Azure Monitor (can we auth/communicate with it)
• Reflect feature in documentation

API Specs

The response should follow the built-in ASP.NET HealthCheckResult.

Considerations

• Determine if we should include validation of configuration here or if the startup is enough?
  • For example, we could corrupt our config via the changing the ConfigMap in Kubernetes.

[tomkerkhove]

The endpoint should be in line with Microsoft Health Check Guidance

[tomkerkhove]

We should use AspNetCore.Diagnostics.HealthChecks

See domaindrivendev/Swashbuckle.AspNetCore#1058 for consuming it in a Swagger documented endpoint.