fix(frontend): fixes optional pipeline inputs. Fixes #11632

[izuku-sds]

Description of your changes:
This PR resolves #11632
Optional pipeline inputs were incorrectly marked as a required field.

This fix ensures that the optional pipeline inputs are not marked as a required field.

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[google-oss-prow]

Hi @izuku-sds. 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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[izuku-sds]

Please review this PR.
/cc @mprahl

[hbelmiro]

/ok-to-test

[github-actions]

Approvals successfully granted for pending runs.

[HumairAK]

/lgtm
/approve

Thank you!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HumairAK

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[asaff1]

is this fix already released? @izuku-sds

[mprahl]

is this fix already released? @izuku-sds

It'll be in the KFP 2.5 release which should be within the next few weeks.