Refactor ListWorkflowTemplateVersions inside pkg/workflow_template.go

[aleksandrmelnikov]

Currently:

func (c *Client) ListWorkflowTemplateVersions(namespace, uid string) (workflowTemplateVersions []*WorkflowTemplate, err error) {

The issue is that this returns WorkflowTemplate instead of WorkflowTemplateVersion.

• Initially, there was no database backing versions, so WorkflowTemplate was returned

Since we have DB backing now, we should refactor this to return the correct struct.

• This function is used part of an API request, so it most likely impacts the UI as well.

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