[backend] Creating a CustomJob component using the provided function can fail

[AlexanderLavelle]

Environment

• How did you deploy Kubeflow Pipelines (KFP)?
  Vertex AI Pipeline

• KFP version:
  Unsure what Google is using in Vertex but with google_cloud_pipeline_components 2.16.0

• KFP SDK version:
  2.7.0

Steps to reproduce

If you try to use create_custom_training_job_from_component without specifying a project, it's possible that the attempt to auto generate the project fails to be found in the Vertex Pipeline and then causes an error.

Expected result

Pipeline should automatically load project, but in some VPC configurations this isn't possible, and explicitly sending the project is required (location is...more optional but may be important to some users for latency or what have you)

Materials and Reference

Was trying to create a component from a function to avoid having a unique container. Pretty neat to use the prebuilt components to avoid having to push my own containers around for simple actions!

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