remove ambassador annotations from pipelines-ui manifest

[theofpa]

Which issue is resolved by this Pull Request:
Resolves #671

Description of your changes:
Remove the ambassador annotations from the manifest of the pipelines-ui service

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate-changed-only
  3. make test

---

This change is 

[k8s-ci-robot]

Hi @theofpa. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Jeffwan]

/ok-to-test

[Jeffwan]

I think it's safe to remove this since ambassador has been deprecated for 2 version

[Jeffwan]

/lgtm

[Jeffwan]

It's better to bring folks working pipeline to help review. Not sure any standalone pipeline user will still use it

[jlewi]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jlewi

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