Update the WorkflowStepDefinition CRD using Kubevela repo as its source of truth

[semmet95]

workflowstepdefinitions.core.oam.dev CRD is present in both Kubevela and Workflow repo, both copies are different, and the Workflow repo copy is older.
This CRD is generated only in the Kubevela repo, hence, instead of keeping its own copy, Workflow repo should fetch it from Kubevela as a part of the CRD manifest process. Treating Kubevela repo as this CRD's source of truth.