chore(bff): use the latest openapi changes

[pboyd]

Description

Use a replace directive in clients/ui/bff for github.com/kubeflow/model-registry/pkg/openapi so it's always on the latest version, and rename it to github.com/kubeflow/hub/pkg/openapi.

Patching changes needed from #1820 that were never brought into the BFF.

How Has This Been Tested?

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.

[Al-Pragliola]

Tried it locally, make docker-build-standalone is the only target that failed with:

--> c6289e78d429
[2/4] STEP 7/12: RUN go mod download
go: github.com/kubeflow/model-registry/pkg/openapi@v0.0.0 (replaced by ../../../pkg/openapi): reading /pkg/openapi/go.mod: open /pkg/openapi/go.mod: no such file or directory
Error: building at STEP "RUN go mod download": while running runtime: exit status 1
make: *** [Makefile:85: docker-build-standalone] Error 1

[pboyd]

I need to rebase this and fix the problem @Al-Pragliola reported.

/hold

[google-oss-prow]

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[pboyd]

@Al-Pragliola, it's fixed now, thanks.

/unhold