feat: Add ability to specify extraContainers

[PurseChicken]

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• Documentation/examples are up-to-date
• All non-functional requirements are met
• If possible, the test configuration is adjusted so acceptance tests cover my changes

Description

This PR adds the ability to utlize extraContainers in the containers spec both globally as well as on individual pods \ jobs.

Main Zitadel Deployment --> .Values.extraContainers
Init Job --> .Values.initJob.extraContainers
Setup Job --> .Values.setupJob.extraContainers
debug_replicaset --> .Values.zitadel.debug.extraContainers

If you specify extraContainers via .Values.zitadel.extraContainers then these will apply to all the above pods.

This will be incredibly useful for various reasons including the ability to add sidecar's like CloudSQL Proxy. I included a commented example of this in the values file in the global extraContainers list (.Values.zitadel.extraContainers)