Add E2E homogeneous graph store training example

[kmontemayor2-sc]

Scope of work done

Add example for graph store homogeneous training, and update splitter slightly to allow tuple-edge types to be passed in.

Will follow up with heterogeneous loop when ready :)

Adding new deployment/configs/e2e_glt_gs_train_resource_config.yaml so we can have GS trainer as a temp workaround

Where is the documentation for this feature?: N/A

Did you add automated tests or write a test plan?

Updated Changelog.md? NO

Ready for code review?: NO

[kmontemayor2-sc]

/e2e_test

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[kmontemayor2-sc]

Sorry, can be hard to see pure GH comments if they're not on a file :/

Let's look at https://console.cloud.google.com/vertex-ai/pipelines/locations/us-central1/runs/hom-cora-sup-test-on-20260303-010325?project=external-snap-ci-github-gigl for a colocated test, and https://console.cloud.google.com/vertex-ai/pipelines/locations/us-central1/runs/hom-cora-sup-gs-test-on-20260303-010325?project=external-snap-ci-github-gigl for a graph store test, both on cora.

They take ~ the same time (43 minutes and change). But I don't see model metrics for either run, see the below for the logs I see in the colocated pipeline/

[KFP Executor 2026-03-03 01:37:09,114 INFO]: Fetching eval metrics from: gs://gigl-cicd-perm/hom_cora_sup_test_on_20260303_010325/trainer/models/trainer_eval_metrics.json

[KFP Executor 2026-03-03 01:37:09,192 WARNING]: Error loading metrics file: 404 GET https://storage.googleapis.com/download/storage/v1/b/gigl-cicd-perm/o/hom_cora_sup_test_on_20260303_010325%2Ftrainer%2Fmodels%2Ftrainer_eval_metrics.json?alt=media: No such object: gigl-cicd-perm/hom_cora_sup_test_on_20260303_010325/trainer/models/trainer_eval_metrics.json: ('Request failed with status code', 404, 'Expected one of', <HTTPStatus.OK: 200>, <HTTPStatus.PARTIAL_CONTENT: 206>), evaluation could have been skipped

is it possible we broke the metrics for these pipelines at some point? I'd rather have that be a separate fix if possible.

[kmontemayor2-sc]

/e2e_test

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/e2e_test

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/e2e_test

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