Detect project ID mismatch in GCP service connector SA credentials

[stefannica]

Describe changes

GCP service accounts are scoped to a GCP project and cannot be used to gain access to resources from another project. When GCP SA credentials from a project are used with a ZenML GCP service connector configured to use another GCP project, unexpected and difficult to debug errors can occur.

This PR adds some logic to validate and report this configuration mismatch.

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[htahir1]

Thanks for this but but two points:

• Are we sure there is not occasions where a service account for one project is given access to other projects (I am not aware of any but just want to make sure)
• If the project is always in cfg.service_account_json and it always has to be the same as what the user says, then why do we ask the user to input it in the first place? Why cant we just take it from there?
• As mentioned internally, please do add more logs around establishing a connection to debug what happens

[stefannica]

Thanks for this but but two points:

• Are we sure there is not occasions where a service account for one project is given access to other projects (I am not aware of any but just want to make sure)

Yes, 100% sure. This is a misconfiguration and should be avoided.

• If the project is always in cfg.service_account_json and it always has to be the same as what the user says, then why do we ask the user to input it in the first place? Why cant we just take it from there?

This is a fair question. I'll look into it.

• As mentioned internally, please do add more logs around establishing a connection to debug what happens

Unfortunately, the connection establishment is located deep inside the GCP Cloud Python library where I have no granular control, but I'll try to enable more verbose logs for those libraries overall.

[htahir1]

@stefannica feel free to merge this and make a follow up ticket for the rest of the work here ahead of the release tomorrow