Proposal for AI Hub v1

[pboyd]

Description

Proposes graduating the Model Registry API from v1alpha3 to v1 and the Catalog API from v1alpha1 to v1, with the following breaking changes:

• Fix inconsistent path parameter casing (smashed lowercase -> snake_case)
• Enforce 400 Bad Request consistently for invalid orderBy fields
• Remove experiment tracking (no UI, no controller, no known adoption)

Includes a nine-month side-by-side deprecation period before alpha removal.

How Has This Been Tested?

N/A

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages
• Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.

[google-oss-prow]

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