[Improvement][UI] Make the select on the page of workflow relation filterable.

[calvinjiang]

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• I had searched in the issues and found no similar feature requirement.

Description

Now the select on the page of workflow relation couldn't input any workflow's name to filter options. And when the workflow name is too long, the options couldn't display the full name. That is so inconvenient. I expect this component can filter options by inputing name.

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

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• I agree to follow this project's Code of Conduct

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