feat: return gcp resources

[donatas-dt]

Description

Return gcp_resources in custom_train_job. Should allow to click "view custom job" in UI.
Relevant documentation: https://cloud.google.com/vertex-ai/docs/pipelines/build-own-components

How has this been tested?

make e2e-tests
make test-all-components
Tests in CICD

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have successfully run the E2E tests, and have included the links to the pipeline runs below
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated any relevant documentation to reflect my changes
• I have assigned a reviewer and messaged them

Pipeline run links:

https://console.cloud.google.com/vertex-ai/locations/europe-west2/pipelines/runs/tensorflow-prediction-pipeline-20230602085628?project=dt-turbo-templates-staging
https://console.cloud.google.com/vertex-ai/locations/europe-west2/pipelines/runs/xgboost-prediction-pipeline-20230602084746?project=dt-turbo-templates-staging
https://console.cloud.google.com/vertex-ai/locations/europe-west2/pipelines/runs/tensorflow-train-pipeline-20230602083603?project=dt-turbo-templates-staging
https://console.cloud.google.com/vertex-ai/locations/europe-west2/pipelines/runs/xgboost-train-pipeline-20230602083557?project=dt-turbo-templates-staging

[donatas-dt]

/gcbrun

[felix-datatonic]

/gcbrun

[ariadnafer]

lgtm!