[0.16.x] Make oidc ssl cert verification configurable

[github-actions]

Backport: #27

Fixes Issue

With this fix we can disable the SSL verification for the Keycloak instance that could be running

Changes proposed

• Add additional client configuration field named auth_verify that can be used to disable the SSL verification for the Keycloak instance

NOTE: this is most likely a temporary fix as we would get rid of the OIDC authentication whenever we would switch to the new API key approach (that is already supported)

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.