[WIP] add sdk specific structure and custom sdk install

[briangallagher]

Changes made to the trainer folder

• Unified SDK install wiring for trainer SDK tests so notebook runs consistently honor KUBEFLOW_GIT_URL, KUBEFLOW_REQUIRED_VERSION, and KUBEFLOW_SDK_INDEX_URL via shared export logic.
• Updated trainer SDK test setup to support token-first auth (NOTEBOOK_USER_TOKEN) with username/password fallback, including username derivation from token for RBAC binding.
• Standardized notebook execution flow to run install_kubeflow.py from ConfigMap before papermill, removing per-notebook hardcoded Kubeflow SDK git install commands.
• Kept trainer behavior backward-compatible by retaining legacy KUBEFLOW_GIT_URL usage in trainer-side installer paths while enabling centralized control from the wrapper.

Addition of kubeflow_sdk folder

• Introduced a new top-level SDK test entrypoint (tests/kubeflow_sdk) to separate SDK-focused orchestration from component-level trainer test implementations.
• Added a thin, scalable Makefile structure: top-level cross-component targets in tests/kubeflow_sdk/Makefile and trainer-specific orchestration in tests/kubeflow_sdk/trainer/Makefile.
• Added shared wrapper script (tests/kubeflow_sdk/scripts/install_kubeflow.sh) to centralize auth resolution, SDK source selection, and notebook image defaults across SDK runs.
• Added documentation (tests/kubeflow_sdk/README.md, tests/kubeflow_sdk/trainer/README.md) with standardized run targets and env contract, enabling future components (e.g. core/spark) to onboard with the same pattern.
• Designed for growth: new component folders can plug into the same top-level SDK orchestration model without changing existing trainer entrypoints.

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[briangallagher]

@sutaakar WIP, but if you want to give quick initial scan to see if any obvious issues/concerns

[openshift-ci]

PR needs rebase.

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