* Allow to Specify the Tenant Console Image. Support Image Pull Secrets by Name.
This PR adds support for `console_image` on create tenant and update tenant so the console image can be set by the caller. This is in case the image used is hosted in a private registry.
Also adds support to specify the Image Pull Secret, if it's not specified, the individual image registry credentials can still be specified.
* Add tests for new fields.
* Support Usage API talk to MinIO over TLS with Insecure
Right now if MinIO is running with TLS, and the certificate is not trusted by console, we fail usage requests. We need to leverage the support for insecure connections so we can read Health Checks and Usage information.
* Remove unusd import
