Clarify KFP getting started endpoint setup

[pragnyanramtha]

Details

• Replaces the unresolved KFP endpoint placeholder in the getting started example with the local standalone endpoint used elsewhere in the docs.
• Adds the matching ml-pipeline-ui port-forward command and tells readers to replace the endpoint for their deployment.

Tickets

• Fixes [Feedback] docs/components/pipelines/getting-started.md #4287

Validation

• git diff --check
• npm ci --ignore-scripts
• HUGO_IGNORELOGS='error-remote-getjson' /tmp/hugo-0.124.1/hugo --gc --minify
• Verified the generated page contains the new endpoint and port-forward text.

AI Assistance

• AI assistance used: yes
• AI was used to prepare this documentation change and run validation.
• Human validation performed: duplicate issue/PR checks, local diff review, and site build verification.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• content/en/docs/components/pipelines/OWNERS

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[google-oss-prow]

Hi @pragnyanramtha. Thanks for your PR.

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[Arhell]

/ok-to-test