[FEAT] - Refactor DEX Controller

[IvoGoman]

Priority

(Medium) I'm annoyed but I'll live

User Story

No response

Description

The DexController is responsible for provisioning DEX resources (OAuth2Client, Connector) for each Organization.
Currently these resources are created in the greenhouse namespace and are thus not accessible for the Organization.
Furthermore, the OAuth2Clients do not specify a ClientSecret, which is required by the oauth2-proxy to be used for securing the services exposed via service-proxy.

Acceptance Criteria

• DexController creates the Dex resources in the Organization's namespace
• OAuth2Clients receive a generated client secret
• ClientSecret for the OAuth2Client is saved in the organizations namespace <org>-dex-secrets

Reference Issues

No response